SD compatibility list

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Note: always measure read speed with this command:

  • in left slot: dd if=/dev/mmcblk0 of=/dev/null bs=4MiB count=100
  • in right slot: dd if=/dev/mmcblk1 of=/dev/null bs=4MiB count=100

If you can afford destroying all your data, you can test write speed. But be careful, you will need to create a new partition table, afterwards! You can use Gparted to make new partition table.

  • in left slot: # dd if=/dev/zero of=/dev/mmcblk0 bs=4MiB count=100
  • in right slot: # dd if=/dev/zero of=/dev/mmcblk1 bs=4MiB count=100


SDHC card brand Card size Card class Full name URL fat32 is working? ext2/3/4 are working? read speed MB/sec write speed MB/sec actual capacity (1K-blocks) Notes
Kingston 1GB unknown Kingston 1GB (blue) [1] (looks very similar to that one, except that I have 1GB) yes yes 12.5 ? ? ok
Kingston 16GB 4 Kingston 16 GB Class 4 SDHC [2] no no 15 ? 15663104 Bad controller chip, fails in the same manner as the 32GB card.
Kingston 32GB 4 Kingston 32 GB Class 4 SDHC [3] no no 16 ? 31539200 Defective flash controller randomly loses writes regardless of filesystem. When attempting to write, blocks sometimes get erased but not written.
Kingston 32GB 10 class 10, kingston 32GB (red) [4] like this, but 32GB: [5] yes no 15.2 ? ? doesn't have badblocks, seems that "Flash Translation Layer" is not suitable for ext filesystems
Patriot 32GB 10 Patriot LX 32GB SDHC Class 10 (PSF32GSDHC10) [6] [7] yes no 18.1 12.6 ? Formatting EXT2 and then running fsck right after finds errors.
Pretec 4GB 10 Class 10, Pretec 4GB, 233x (white/green) [8] yes yes I had very few fsck problems, and after several tries running fsck, they eventually got corrected. 14.0 ? ? It looks very similar to that broken 32GB pretec. Except that this one almost works good.
Pretec 32GB 10 class 10, Pretec 32GB 233x (white/green) [9] yes no 14.1 12.4 ? doesn't have badblocks, seems that "Flash Translation Layer" is not suitable for ext filesystems
SanDisk 32GB 4 SanDisk Ultra 32 GB Class 4 SDHC [10] yes yes 16.4 7.1 ? OK.
Sandisk 64GB 4 Sandisk 64GB SDXC Class 4 [11] yes yes 16.1 4.5 62367744 Works fine
Transcend 32GB 10 Transcend 32GB SDHC Class 10 [12] ? no ? ? ? Has serious issues
Transcend 64GB 10 Transcend SDXC Card 64GB ULTIMATE CLASS 10 (PN:TS64GSDXC10) [13] yes (needs more testing) no 16.1 16.1 ? After some time the system gives read/write errors. Works fine on a pc with linux with ext2/ext3.
Zap 32GB 4 Zap Glider 32GB Class 4 [14] ? yes 16.6 4.6 ? Works fine