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  1. tdcrone's Avatar
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       #1  
    I bought one of the buy.com Kingston MiniSD cards (nominally class 4, 4GB) and finally got around to doing some bench testing on it. Other threads were mostly SD, so I started a new one for those of use of us in the 755 world.

    To answer another question from long ago, I can't find anything on PalmOS that will recognize a second partition on the card. Multiple cards work in, for example, UniCMD, but multiple partitions on a single card do not, regardless of format. (Thinking about this as I write, I did not try "Disk Manager"... this is the only application I know of that might have solved the problem. Based on my VFSMark results I'm not as interested as I was, though I'll probably use DM to make a softcard for short-term files like voice recordings and videos.)

    I have noticed that file writes to the SD card are quite slow, but this appears to be a function of >~500KB of information. In other words, I can (using Blazer, for example) download something that is <500KB quickly, but if it is more than this there is a very distinct pause and resume at each 500KB interval. I do not see this delay if downloading to RAM or a RAM disk. (I mention it because I suspect that may account for differences between VFSMark and other tools, as VFSMark seems to run for a long time when writing.)

    My VFSMark results for the card itself are pretty consistent for any one of the below setups, but the end results vary widely based on the variables (formatting program, allocation size, data content). I'm putting my results here in the hope that they will be useful to someone else, and maybe encourage other people to VFSMark their cards so I know what to buy next time. =)

    To save you some reading, the clear winner was the card formatted SDHC defaults using the Panasonic utility http://panasonic.jp/support/global/c...formatter.html
    which looks like FAT32 32K (format /a:32k) but for some reason works slightly better in some ways, according to VFSMark.

    Lots of raw data follows, no further commenting on my part. All results were with the card empty and formatted with WXP command line 'format /a:x', except as noted. For your geeky pleasure.

    Cheers,
    -Tim

    ----

    Kingston 4GB Class 4 MiniSDHC, Windows XP GUI (FAT32/default(4k?)) (These results were consistent with the onboard format):
    file create 36%
    file delete 9%
    file write 8%
    file read 760%
    file seek 2950%
    db export 7%
    db import 90%
    record access 1131%
    resource access 1010%
    vfsmark 666

    Kingston 4GB Class 4 MiniSDHC, 2GB partition at FAT16/default(16k?):
    file create 125%
    file delete 38%
    file write 13%
    file read 814%
    file seek 3933%
    db export 58%
    db import 92%
    record access 1064%
    resource access 1097%
    vfsmark 803

    Kingston 4GB Class 4 MiniSDHC, 2GB partition at FAT16/32k:
    file create 127%
    file delete 61%
    file write 12%
    file read 814%
    file seek 3933%
    db export 58%
    db import 88%
    record access 1064%
    resource access 1097%
    vfsmark 806

    Kingston 4GB Class 4 MiniSDHC, 4GB partition at FAT32/1024:
    file create 13%
    file delete 3%
    file write 5%
    file read 748%
    file seek 2360%
    db export 2%
    db import 91%
    record access 786%
    resource access 872%
    vfsmark 542

    Kingston 4GB Class 4 MiniSDHC, 4GB partition at FAT32/16k:
    file create 65%
    file delete 18%
    file write 11%
    file read 814%
    file seek 3933%
    db export 32%
    db import 88%
    record access 1034%
    resource access 1066%
    vfsmark 784

    Kingston 4GB Class 4 MiniSDHC, 4GB partition at FAT32/32k:
    file create 66%
    file delete 18%
    file write 12%
    file read 800%
    file seek 3933%
    db export 32%
    db import 93%
    record access 1064%
    resource access 1097%
    vfsmark 790

    Kingston 4GB Class 4 MiniSDHC, 4GB partition at FAT32/32k formatted with sdfv2002:
    file create 1115%
    file delete 641%
    file write 13%
    file read 814%
    file seek 2950%
    db export 43%
    db import 88%
    record access 1064%
    resource access 1010%
    vfsmark 859

    Kingston 4GB Class 4 MiniSDHC, 4GB partition at FAT32/32k formatted with sdfv2002 and ~3.5GB of unfragmented data:
    file create 82%
    file delete 34%
    file write 12%
    file read 814%
    file seek 2950%
    db export 45%
    db import 81%
    record access 1292%
    resource access 1280%
    vfsmark 732
  2. #2  
    tdcrone,

    Thanks for the info - I just bought a Kingston 4gb minSD Class 6 card and compared to my Sandisk 2gb card Class ? that I bought from the Sprint store when the 755p came out - my kingston is "way" faster.

    Using NVBackup to backup my 755p onto my 2gb card normally takes 4min 50secs - backing up my 4gb card takes 1min and 30sec - my 2gb must be a very slow class! :-)
    www.MouseGlider.com
    Come Glide with Us

    Rock Solid and Stable - Sprint Centro and Treo 755p

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