accessory:emmc:reference_chart

eMMC Module

  • Check the eMMC module compatibility.
  • If the OS on your eMMC is corrupted or the eMMC has a wrong boot loader, reinstall a proper boot loader on the eMMC via eMMC Recovery.
  • The Green eMMC modules work with ODROID-C0/C1/C1+/C2/C4/XU4/H2/H3/N2/M1 series.
  • The Orange eMMC modules work with ODROID-C0/C1/C1+/C2/C4/XU4/H2/H3/N2/M1 series.
  • The Black eMMC modules work with ODROID-C0/C1/C1+/C2/C4/H2/N2.
  • The Red eMMC modules work with ODROID-C0/C1/C1+/C2/C4/XU4/H2/N2.


As of November 2023, the module equipped with Phison's eMMC chipset on a Green PCB is the latest product.

Phison 16GB eMMC Module

16GB eMMC module uses the Phison eMMC chipset.

eMMC Reader ok

The Phison eMMC chipset does support the legacy 4bit interface mode and you can use it with the original eMMC-to-MicroSD adapter (reader board).

You can use this eMMC reader to read and write with USB Multi-reader via legacy 4bit interface mode.
https://www.hardkernel.com/shop/emmc-module-reader-board-for-os-upgrade/

You might want this eMMC Writer we have made that can read/write via the native eMMC 8bit interface.
https://www.hardkernel.com/shop/usb3-0-emmc-module-writer-2//

Kingston 128GB/256GB eMMC Module

128GB and 256GB eMMC module uses the Kingston eMMC chipset.
Kingstone 128GB/256GB eMMC
eMMC Reader ok

The Kingston eMMC chipset does support the legacy 4bit interface mode and you can use it with the original eMMC-to-MicroSD adapter (reader board).

You can use this eMMC reader to read and write with USB Multi-reader via legacy 4bit interface mode.
https://www.hardkernel.com/shop/emmc-module-reader-board-for-os-upgrade/

You might want this eMMC Writer we have made that can read/write via the native eMMC 8bit interface.
https://www.hardkernel.com/shop/usb3-0-emmc-module-writer-2//

Micron 128GB eMMC module

Among the 128GB eMMC modules, the model that used Micron chipset has been discontinued.
Micron 128GB eMMC

eMMC Reader X

The Micron eMMC chipset doesn't support the legacy 4bit interface mode and you can't use it with the original eMMC-to-MicroSD adapter (reader board).
Therefore, you need this specific eMMC WRITER to flash the Micron eMMC via native eMMC 8bit interface mode.

You might want this eMMC Writer we have made that can read/write via the native eMMC 8bit interface.
https://www.hardkernel.com/shop/usb3-0-emmc-module-writer/

Orange eMMC module

The Orange eMMC module uses eMMC 5.1 chipset. We started to ship it from October 2017.

It works with any of C1/C2/C4/XU4/H2/H3/N2/M1 series with a proper OS. The latest official OS images all work fine.
Orange eMMC module schematics : eMMC PCB Rev 0.4

The Orange eMMC Module Rev0.5 has been shipped since January 2020.

The Orange eMMC PCB Rev0.4 and Rev0.5 have the same schematics.
However, we modified it to reduce PCB defects by increasing the cleanrance between PCB patterns.

If you want to use the Orange eMMC with XU4 platforms stably, the Kernel version must be higher than 4.9.58 or 4.14.6.

Orange eMMC compatibility status with XU4 series OS images

OS image Image file information Status
Ubuntu 18.04 Mate ubuntu-18.04-4.14-mate-odroid-xu4-20180501.img OK
Ubuntu 18.04 Minimal ubuntu-18.04-4.14-minimal-odroid-xu4-20180531.img OK
Ubuntu 16.04 Mate ubuntu-16.04.3-4.14-mate-odroid-xu4-20171212.img OK
Ubuntu 16.04 Minimal ubuntu-16.04.3-4.14-minimal-odroid-xu4-20171213.img OK
Android 7.1.1 Alpha-1.1_14.11.17 OK
Android TV 7.1.1 Alpha-1.0_20.11.17 OK
Android 4.4.4 Android 4.4.4 (v5.8) OK
Debian Jessie Debian-Jessie-1.1.4-20171121-XU3+XU4.img OK
ODROID Game Station Turbo(OGST) ODROID-GameStation-Turbo-3.9.5-20171115-XU3+XU4-Jessie.img OK
Armbian All Armbian variants starting with version 5.35 OK
OMV OMV_3_0_92_Odroidxu4_4.9.61 OK
DietPi DietPi_OdroidXU4-armv7-(Jessie).7z 22-Nov-2017 OK
Yocto project Untested
Kali-Linux Kali 2018.2 OK
Arch-Linux Untested
ROS Untested
Lakka Lakka-OdroidXU3.arm-2.1-rc6.img.gz OK
Batocera batocera-5.12-xu4-20171214.img.gz OK
RecalBox recalbox (17.11.10.2) OK
RetroPie ORA(Odroid Retro Arena) 1.5x OK

How to distinguish the Sandisk eMMC ver 5.1 from the 5.0

The eMMCs from Sandisk will be version up to 5.1 with slightly faster data transfer speed starting from 20th of July 2017.
As shown in the figure below, the QR code is on the left side of the ver5.1 ​chipset while eMMC ver 5.0 has it on the right side.

eMMC 5.0 eMMC 5.1

Old Kernel 3.10 should have this patch to make it work with XU4 series properly.
Github
Github
Github

eMMC modules for year 2016~2019

The Black eMMC modules work with only ODROID-C0/C1/C1+/C2/C4/H2/N2. It is not compatible with XU/XU3/XU4/U2/U3/X/X2.
Other Blue/Red/Orange eMMC modules work with all ODROID boards.

eMMC modules for old products

Note: XU4 and XU3 have software compatibility each other.

Compatibility with USB3.0 to eMMC Reader

It is not related to their version or capacity but color.

Listed all kind of eMMC are compatible with USB3.0 to eMMC Reader.

RED ORANGE BLUE

This black PCB based eMMC module is NOT compatible with USB3.0 to eMMC Reader.

BLACK

eMMC Module & eMMC Reader Schematics

Download old eMMC module Revison 0.3 schematics
Download Orange eMMC module Revision 0.4 schematics

eMMC reader board schematics
eMMC board dimensions : 18.5mm x 13.5mm
Gap between the PCBs : 1.1mm (Height of assembled B2B connectors

eMMC connector specification

The connector is made by LS-Mtron Korea.
On the eMMC module, we've used the GB042-34S-H10 (Socket-34pin).
On the host board, we've used the GB042-34P-H10 (Plug-34pin).

The connector specification is here

Information about Sandisk eMMC (iDisk Extreme)

Information about Samsung eMMC

Information about Essencore eMMC (This 8GB eMMC was used for XU4 long time ago)

Information about Toshiba eMMC

ODROID-C4 + Orange eMMC Performance Test of File I/O
Test condition
OS : ubuntu 20.04
kernel version : Linux odroid 4.9.218-25
Test tool : iozone revision 3.489
iozone install & performance test

target
$ sudo apt install iozone3
$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
/* 8G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    32835    39198    30593    30638    30064    37580
  102400      16    55605    55864    77602    77210    77025    55587
  102400     512    56324    56335   167658   167931   155491    55992
  102400    1024    56388    56402   168213   168464   156691    56366
  102400   16384    56307    56508   170166   170325   169964    56772
 
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    34479    40603    30540    30163    30095    37737
  102400      16    54340    54432    77096    77102    76993    53930
  102400     512    54444    54501   166421   166753   151607    54232
  102400    1024    54343    54479   167804   168047   158466    54213
  102400   16384    54346    54524   170215   170685   170251    54439
 
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    34659    40006    30456    30653    30585    40189
  102400      16    81093    89477    77379    77343    77078    88657
  102400     512   111766   112174   167889   168013   153708   112190
  102400    1024   112247   112418   168818   169020   157981   112252
  102400   16384   111973   111996   170058   170593   170312   112344
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    32720    39823    30021    30005    29905    39021
  102400      16    77273    83613    75869    76174    75637    82888
  102400     512   138202   136923   161642   162313   149562   138764
  102400    1024   137274   138298   163043   163388   152816   138989
  102400   16384   148874   148710   167319   167598   167464   149640
 
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    28836    33497    27364    27063    26278    29271
  102400      16    72122    77892    70063    70047    69312    77770
  102400     512   137289   136301   165930   166323   149172   136535
  102400    1024   137023   135748   166734   166979   153839   136675
  102400   16384   140365   139800   167435   168381   167079   141673
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    33584    40215    51154    51199    23919    39794
  102400      16    80918    90055   108995   109129    36437    88810
  102400     512   146965   150420   169497   169657   142405   147800
  102400    1024   149453   150958   170611   170811   155329   148850
  102400   16384   151633   153443   172487   172802   171909   151536
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    33499    39214    29557    26563    26518    38483
  102400      16    73302    79872    58255    55327    50313    79033
  102400     512   125537   126293   159396   155847   135211   124753
  102400    1024   128047   131522   162144   158665   148982   129675
  102400   16384   142979   143819   167963   164524   164166   143706
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    32278    37995    34007    30566    27503    39874
  102400      16    77734    85481    63120    59560    54822    84799
  102400     512   130740   134064   159775   158516   143590   133448
  102400    1024   139269   138432   162351   162441   154119   140247
  102400   16384   150996   150280   167234   167523   167148   151845
 
/* 128G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    33622    40040    51308    51370    28990    39711
  102400      16    81102    90909   109770   110064    44338    89445
  102400     512   143862   146391   169909   170235   153661   144544
  102400    1024   146351   146557   171018   171335   163848   145926
  102400   16384   147127   149564   173078   173382   172763   147816
 
/* 256G */
                                                       random   random
      kB  reclen    write  rewrite     read    reread    read    write
  102400       4    35343    41892    53301    53512    29539    41368
  102400      16    82616    89965   109957   110096    45359    88753
  102400     512   139487   145019   170448   170577   156325   143786
  102400    1024   143326   147521   171274   171498   163135   143271
  102400   16384   146234   141246   172988   173438   172876   147867
/* 16G */
                                                       random   random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    29525    33540    49719    49695    25218    33282
  102400      16    69789    74165   105857   105700    38842    71255
  102400     512   115686   118890   165539   165725   144810   104077
  102400    1024   115049   101630   168551   168762   152159   110698
  102400   16384   119040   107407   167162   167471   166496   116247

ODROID-N2Plus + Orange eMMC Performance Test of File I/O
Test condition
OS : ubuntu 20.04 minimal
kernel version : Linux odroid 4.9.230-88
Test tool : iozone revision 3.489
iozone install & performance test

target
$ sudo apt install iozone3
$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
/* 8G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    37518    44227    33183    33089    33049    46391
  102400      16    56351    56539    80518    80424    80258    56310
  102400     512    56655    56766   160631   161022   148955    56375
  102400    1024    56627    56751   161111   161364   150157    56585
  102400   16384    56471    56684   163643   163909   163668    56274
 
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    38035    44223    33210    33195    32748    43092
  102400      16    54323    54679    80294    80418    80284    54355
  102400     512    54737    54791   159582   159578   145576    54473
  102400    1024    54801    54726   159838   160316   149142    54484
  102400   16384    54651    54767   163614   163968   163703    54684
 
/* 32G */
                                                                random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    39049    44400    32450    32448    32287    43891
  102400      16    83239    92206    78486    78843    78234    90928
  102400     512   111459   111460   161389   161604   148190   111381
  102400    1024   111436   111550   162192   162440   152001   111355
  102400   16384   111336   111311   163861   164100   163658   111236
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    37627    44375    32477    32488    32597    45050
  102400      16    83902    94060    78950    78706    78827    93485
  102400     512   149500   151792   161603   161924   148691   153336
  102400    1024   152307   152700   162246   162556   152416   153682
  102400   16384   155768   154567   163946   164153   163931   156139
 
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    30385    33826    27532    27596    27405    32611
  102400      16    78443    86788    72825    72707    71967    86350
  102400     512   138058   138790   160191   160835   141309   138554
  102400    1024   140770   141342   160935   161193   146787   142336
  102400   16384   142275   141434   163060   163184   162785   145041
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    38240    44133    53719    52943    25436    44345
  102400      16    88212    96926   113783   114007    36505    96138
  102400     512   148050   150385   163130   163342   136156   148508
  102400    1024   149211   151129   163721   163949   151700   148553
  102400   16384   153910   153899   166749   167014   166324   152890
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    33675    37850    29913    26874    26944    38551
  102400      16    78886    87606    58931    56032    50331    84679
  102400     512   138449   142123   158449   155095   134292   135856
  102400    1024   140674   141172   160065   156586   147072   137302
  102400   16384   142514   143227   162002   158654   158130   142928
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    34965    41055    35466    31419    28407    43139
  102400      16    83070    94327    65219    61588    56948    93766
  102400     512   146947   150413   156439   158819   143337   148538
  102400    1024   148779   149973   159754   159896   152491   151143
  102400   16384   150929   151739   161511   161777   161433   153665
 
/* 128G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    37671    46277    56919    57037    32146    43280
  102400      16    80835    91312   112741   112976    46705    92198
  102400     512   130581   131476   159061   159155   145623   127750
  102400    1024   133857   137538   160437   160596   153578   134203
  102400   16384   147215   147702   166812   166948   166501   147470
 
/* 256G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    37214    44290    56372    54960    30135    40862
  102400      16    79444    86377   104849   105027    44122    85813
  102400     512   126402   131088   157322   157489   145196   129783
  102400    1024   131284   131438   157716   157956   152170   129575
  102400   16384   148843   147986   166830   166951   166351   147346
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    30832    39541    55592    55123    26333    36726
  102400      16    70404    73991   102791   102959    38836    71856
  102400     512   116535   106482   161506   161733   135051   110427
  102400    1024   101982   107929   162708   162885   148214   110017
  102400   16384   106282   113393   161780   162153   161362   114261

ODROID-M1 + Orange eMMC Performance Test of File I/O
Test condition
OS : ubuntu 20.04.5 LTS
kernel version : 4.19.219-odroid-arm64
Test tool : iozone revision 3.489
iozone install & performance test

target
$ sudo apt install iozone3
$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
/* 8G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12781    14724    27185    27196   26994     15087
  102400      16    39546    44489    65722    64090   63876     43310
  102400     512    54796    55694   142812   142812  139994     55361
  102400    1024    53200    53829   152548   153155  149090     53484
  102400   16384    55365    55533   168597   168597  168657     55558
 
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12511    14866    27384    27378    27097    14888
  102400      16    39683    44396    69166    68928    68758    44284
  102400     512    54457    54683   166031   166403   162883    54289
  102400    1024    54748    54757   168311   168813   164991    54533
  102400   16384    54490    54535   171904   172295   171928    54475
 
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    11688    13934    22917    22941    22492    13767
  102400      16    37928    42574    61203    61250    60694    39506
  102400     512   129207   131694   160140   156886   151860   133913
  102400    1024   114330   119817   153728   162792   154863   133347
  102400   16384   135599   134033   161777   166293   162166   136565
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12581    15031    27424    27444    27360    15175
  102400      16    40424    45807    66086    69139    69742    45549
  102400     512   145118   146547   165990   166719   163334   146866
  102400    1024   147290   148161   168163   168813   164621   148442
  102400   16384   150467   150748   171864   172218   172210   150434
 
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12455    14532    23625    23727    23693    14266
  102400      16    39370    43703    64408    64145    64474    41431
  102400     512   134825   136966   163891   164631   160786   136636
  102400    1024   136700   138199   166730   167139   163357   137507
  102400   16384   139529   138618   168881   169709   170494   138767
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12827    15294    26729    23937    23819    15131
  102400      16    38869    43866    49198    49047    46194    43633
  102400     512   131408   134415   166711   166146   152235   131249
  102400    1024   131413   134780   169308   168776   154753   132851
  102400   16384   136694   137721   173302   172761   172059   136574
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12761    15030    31094    27549    24529    15138
  102400      16    40143    44790    56516    53963    48802    44233
  102400     512   140701   143524   166189   165234   157067   143421
  102400    1024   142326   144598   168329   167424   158990   143770
  102400   16384   146664   147160   171947   172381   171705   147012
 
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    12861    15450    44637    44628    26412    15268
  102400      16    38990    44013    93566    93756    42981    43585
  102400     512   136507   137121   167479   167817   162001   135979
  102400    1024   133648   138500   170097   170526   163593   138287
  102400   16384   141362   142644   173823   174237   173824   143183
 
/* 256G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    13082    15381    44688    44660    26430    15264
  102400      16    40221    45389    97250    97448    43249    45281
  102400     512   136241   138718   166644   166948   160342   137122
  102400    1024   138889   140111   169056   169614   163135   134994
  102400   16384   143255   142462   173167   173681   173050   142114
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4     9778    11271    43495    43513    22148    11109
  102400      16    31444    36326    91564    91005    36500    35840
  102400     512    97470   106604   165278   165769   153560   105355
  102400    1024   110347   104241   167632   168033   153439   107114
  102400   16384   110835   100751   168688   169242   168194   109004

Unit : MByte/sec

Samsung Toshiba Sandisk
8G Write 45.4 21.9 N/A
8G Read 113 148 N/A
16G Write 80.1 N/A 25.6
16G Read 126 N/A 153
32G Write 124 N/A 98.7
32G Read 125 N/A 153
64G Write 124 83.7 107
64G Read 124 153 153

Note 1: Write/Read command for the eMMC benchmark.
$ dd if=/dev/zero of=test.tmp oflag=direct bs=1M count=1024
$ dd if=test.tmp of=/dev/null iflag=direct bs=1M

ODROID-C2 + Black eMMC Performance Test of File I/O
Test condition
ubuntu 16.04
kernel version : Linux odroid64 3.14.79-115
Test tool : iozone revision 3.429
iozone install & performance test

target
$ sudo apt install iozone3
$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
/* 8G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4     9290    13582    13570    13568    11900     8787
  102400      16    10934    15680    27511    27484    25976     7699
  102400     512    14943    23761    42163    42121    41361    15122
  102400    1024    15140    28564    41951    41915    41196    16743
  102400   16384    16559    24001    42308    42267    42287    28604
 
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    14602    14622    18102    17953    16768    14421
  102400      16    49363    49279    52902    52808    47450    48389
  102400     512    49779    49993   138268   138315   137171    48836
  102400    1024    50005    49870   137522   137709   136958    49027
  102400   16384    49861    50058   139358   139154   139299    50024
 
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    14608    14670    18333    18343    17935    14624
  102400      16    58393    66157    56412    56766    55744    56371
  102400     512    80356    81074   136828   137132   137503    79224
  102400    1024    80464    81036   137368   137278   136896    79191
  102400   16384    80388    81070   139486   139612   139446    80560
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    14240    14299    17619    17548    16012    14216
  102400      16    49991    57484    53245    53405    50001    59302
  102400     512   132316   135079   134154   134016   134208   129755
  102400    1024   132476   134966   133753   133840   133677   130054
  102400   16384   135772   139140   136133   136019   135821   135107
 
/* 128G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    14162    14152    18161    18184    17833    14200
  102400      16    56527    64906    55057    55684    54492    66525
  102400     512   131327   131444   137307   137040   137358   132500
  102400    1024   131908   131896   137570   137495   136844   132365
  102400   16384   136418   134070   139940   133304   121160   134002

Note 2:
Black eMMC module is made with Samsung eMMC chipset.
Red/Blue(normal) eMMC module is made with Sandisk or Toshiba or AIO chipset.
C1/C0/C1+/C2 works with Black and Red eMMC modules.
XU4/XU3/U3/X2/U2 do NOT work with Black eMMC module.

/* 128G */
                                                      random   random
      kB  reclen    write  rewrite    read    reread    read    write
  102400       4    32874    36867    50214    50341    25392   36501
  102400      16    74732    79623   107393   107390    36511   79352
  102400     512   135281   137200   164775   164973   139135  133858
  102400    1024   135909   137954   165426   165360   149826  132427
  102400   16384   141450   142561   169225   169295   168458  137902
/* 32G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    31773    35594    28970    28975    28194    35193
  102400      16    74099    81195    81017    81017    54209    74104
  102400     512   124345   128423   159007   158716   131953   122613
  102400    1024   124830   130742   160064   160086   137279   125592
  102400   16384   132372   136467   164411   164750   163113   133211
 
/* 64G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    33524    37231    34295    34152    30185    36985
  102400      16    78771    83978    77718    77885    57565    79458
  102400     512   135834   137782   155622   155641   132819   132577
  102400    1024   135879   135265   156631   156588   137693   131499
  102400   16384   142370   142884   160526   160649   159443   137578
 
/* 128G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    31062    34176    48180    48353    26918    34223
  102400      16    70050    74981   101402   103518    39782    73712
  102400     512   120868   122795   160083   154529   144161   121567
  102400    1024   122158   123736   161075   155506   150165   123052
  102400   16384   130579   127729   165457   165434   164230   129500
 
/* 256G */
                                                       random   random
      kB  reclen    write  rewrite     read   reread     read    write
  102400       4    32701    37377    53711    52818    29092    35576
  102400      16    72568    77136   104471   104206    44905    76810
  102400     512   127924   125988   164116   164219   148316   129120
  102400    1024   129910   130725   164955   164970   158150   129831
  102400   16384   135255   135654   169691   169697   169012   136947
/* 16G */
                                                      random    random
      kB  reclen    write  rewrite    read    reread    read     write
  102400       4    27916    30335    48905    48747    24700    29577
  102400      16    57451    59831   100158   100195    35249    59029
  102400     512   102489    96786   161248   161320   133787    89844
  102400    1024    91714   105576   160818   160730   150458   105643
  102400   16384   109592   110296   160751   160782   160854   109196

Discontinued 8GB eMMC Red PCB for XU4 model is based on Essencore/AIO's eMMC 5.0 technology.

Sequential speed with “dd” test
dd write : 15.1 MB/s
dd read : 104 MB/s

Random access(IOPS) speed test with 4k block.
Random write : io=993228KB, bw=9928.2KB/s, iops=2482
Random read : io=1479.1MB, bw=15149KB/s, iops=3787

16GB eMMC Black PCB
16GB UHS-1 SDHC Card (Sandisk SDSDQAD-016G UHS-I 50 OEM model)

Cleanly flashed Android 5.1 V2.8 image and installed GApps Pico package.
eMMC booting time from power on event : 18~20 seconds
SDHC booting time from power on event : 32~35 seconds

* Do not overwrite the hidden eMMC boot partition. If you have, go here to recover: How to recover the eMMC boot loader.

* eMMC must be partitioned like so;
—FAT16 partition with UUID 6E35-5356 (boot)
—EXT4 partition with UUID e139ce78-9841-40fe-8823-96a304a09859 (linux)

* Copy contents from Ubuntu image partitions to the boot and linux partitions using “cp -afpv source destination”

* Insert eMMC and boot normally.

  • accessory/emmc/reference_chart.txt
  • Last modified: 2024/04/02 17:01
  • by justin