David Wilkinson wrote:
I tested this card on my Windows 7 x64 desktop machine (using an external card
reader) and got very similar results:

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                            Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

            Sequential Read :    18.171 MB/s
           Sequential Write :    11.250 MB/s
          Random Read 512KB :    17.789 MB/s
         Random Write 512KB :     0.356 MB/s
     Random Read 4KB (QD=1) :     3.058 MB/s [   746.6 IOPS]
    Random Write 4KB (QD=1) :     0.003 MB/s [     0.8 IOPS]
    Random Read 4KB (QD=32) :     4.018 MB/s [   981.0 IOPS]
   Random Write 4KB (QD=32) :     0.003 MB/s [     0.8 IOPS]

   Test : 1000 MB [I: 24.4% (7.3/29.8 GB)] (x5)
   Date : 2012/06/13 9:28:28
     OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

-----------------

So I guess it is the card...

After considerable research, I bought a new card:

SanDisk 32GB Extreme SDHC Memory Card (SDSDRX3-032G-A21) - 45MB/s

and got dramatically better results for the 4KB writes (on my Windows 7 
machine):

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    18.063 MB/s
          Sequential Write :    17.264 MB/s
         Random Read 512KB :    17.653 MB/s
        Random Write 512KB :     1.591 MB/s
    Random Read 4KB (QD=1) :     2.721 MB/s [   664.2 IOPS]
   Random Write 4KB (QD=1) :     1.194 MB/s [   291.6 IOPS]
   Random Read 4KB (QD=32) :     2.422 MB/s [   591.3 IOPS]
  Random Write 4KB (QD=32) :     0.928 MB/s [   226.5 IOPS]

  Test : 1000 MB [I: 0.0% (0.0/29.7 GB)] (x5)
  Date : 2012/06/15 13:51:56
    OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

Next step: try it in my Windows 8 tablet and put my SeaMonkey profile on it.

Question: if you were me, would you format it as NTFS? Or just leave well alone and hope I do not want to copy files bigger than 4GB onto it.

--
David Wilkinson


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