手机格式化SD卡降低性能

visior

昨天入手了两片卡，一个是金士顿1GSD，一个是金士顿1GMicroSD。第一次用手机格式化的时候，必死机，两片都是。
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拔电池重启以后，发现两片卡都能正常使用。但是用VFSMark测试性能出现很大的下降。都从近800分降低到600多分，而且在实际使用中能明显感觉到差异，比如用Nvbackup备份的时候，进度条明显变慢。备份时间从3分25秒延长至4分45秒。
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性能的变化太大了，值得引起重视。
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不知道该怎么格式化才是最好的呢？？？？

visior

有人说采用16K/簇格式化sd卡，性能将得到提升，还给出了dos下格式化命令：
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Format k: /fs:fat32 /a:16K

但是我在winxp下运行cmd，再入这串命令，却不能格式化，说簇太大了，不知何解

alandeng19

我用32k格式化，没有任何有慢的感觉 VFSMark 520多分

visior

LS的卡是怎么格式化的？

卡是什么型号的？

alandeng19

format X: /FS:FAT32 /A:16K
(or maybe format X: /FS:FAT32 /A:32K)
where "X" is the drive letter.

卡型号： Transcend 8G SDHC Class 6

你的卡不是SDHC的，也许不用这么格式吧？ SDHC是SD 2.0的标准，支持FAT32格式，2GB以上的卡……也许你的卡用FAT格式的就可以了
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6 E1 E; F2 L, _" v' x* o+ r$ _$ z6 v4 i[ 本帖最后由 alandeng19 于 2008-4-24 14:18 编辑 ]

alandeng19

From what I understand, the cards will work much slower if you format them on your Treo.
You can use one of the following methods to format a card on XP so that the Treo can read it - and it should be fast....

format X: /FS:FAT32 /A:16K
# e8 G/ m! {( S4 Z# Q3 n7 g- M$ s(or maybe format X: /FS:FAT32 /A:32K)
% u! `/ x' I, a( wwhere "X" is the drive letter.
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"Go to "Control Panel" then select "Computer Management."
- H2 v& \/ E% N6 _# C( j: b! r5 c8 KUnder "Storage", select "Disk Management" and when that reads and pops up, select the volume attributable to your card (on my PC, it's "N:" because I have a whole bunch of USB removable drives, but it may be a different letter on your PC), then right click.
1 V* A2 T' Z& b- P! h; Y2 ^: }Select "Format" after you right click, then select FAT32 under "File system" and 32K under "Allocation unit size".
3 t* @# D1 G3 e* X3 |- nMake sure you check the box for "Perform a quick format" because I've heard that for some reason data corrupts on the card if you don't.
6 i0 a  A6 f2 O0 \4 FThen click OK and you're good to go.
It should take only a few seconds, certainly not more than a minute, to format.  If it takes more than a few minutes, then you probably have a defective card."
/ {& x0 c+ n3 ^8 `I've seen advice that recommends an allocation unit size of 16kb and 32kb.  I don't know for sure which is best, but the card speed testing software seems to slightly favour 32kb.

alandeng19

原帖由 visior 于 2008-4-24 13:48 发表
有人说采用16K/簇格式化sd卡，性能将得到提升，还给出了dos下格式化命令：

Format k: /fs:fat32 /a:16K

1 K6 V, g% B3 }- h3 z但是我在winxp下运行cmd，再入这串命令，却不能格式化，说簇太大了，不知何解

换成4K 试试？我发现在windows 的磁盘簇大小也仅仅是4K