Setting SD Speed Manually

Discussion in 'Supercard' started by crystalklear64, Jun 5, 2009.

Jun 5, 2009
  1. crystalklear64
    OP

    Newcomer crystalklear64 Member

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    Hello,

    I recently updated my SCDS sdhc OS to the latest and forgot to save my speed settings, so I figured its time I did a little learning.

    Now, the speed test included with the OS is trash, and never works, telling me my card is too slow to be supported.

    Instead, using the libfat tool, I see that my average access time for sequential is .4 ms with a .8ms max (421 us, 813us), random average and max being both around 8.5ms.

    The card is a japanese 2gb kingston formatted in fat16.

    So with all this in mind, what speed settings can I expect to use, and why? ex. if someone says, you're good to use x5 with 25, how do you come to that conclusion? What can I use the access times for to determine what that means concerning the number I set in the global.ini?

    Thanks.
     
  2. gamadaya

    Newcomer gamadaya Member

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    I don't really know what the access times have to do with it, but a way you can see what value to set the first value in the .ini to (I think the first is the 1-6 one) is by checking you're read/write time. It's simple actually. 6mb/s is a value of 6, 5mb/s is 5, and so on. Then you base the other value (1-32) on basically however high you can set it without everything crashing on you. And yeah, the speed test in the OS sucks. It gives my 32 speed card a recommended speed of 11.

    And I don't know how to check read/write times. Sorry [​IMG]. I actually don't know a lot about these cards, but this is what little I do know. Did yours actually come formatted in fat16? I have a 4 gb kingston, and it was in fat32. With the Windows formatter, I I can format to fat32, exfat, and just fat. Is fat the same as fat16? I might want to switch to that if it is.
     
  3. Overlord Nadrian

    Banned Overlord Nadrian Banned

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    FAT is for cards < 2GB; FAT32 is for cards > 2GB.
     
  4. geokilla

    Member geokilla GBAtemp Regular

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    I have no idea what you're saying.....
     

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