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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- N4 {! j- h) k9 b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。

0 n1 t: \9 W6 d0 ?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：

$ H/ [: `3 P$ k0 I6 b7 zFormat k: /fs:fat32 /a:16K
3 V* _- b0 {& ~  g* O1 I
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？
2 Y# _3 ]" q! e% Y/ E) N
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
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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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[ 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
- [4 q7 A" n9 Z( x0 U0 h(or maybe format X: /FS:FAT32 /A:32K)
where "X" is the drive letter.
0 G' l. `: |- s3 F, }* s2 eOR
"Go to "Control Panel" then select "Computer Management."
3 Q/ p. u& e/ W% 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.
" \; Y/ ~" Q, D& B  A& iSelect "Format" after you right click, then select FAT32 under "File system" and 32K under "Allocation unit size".
Make 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.
+ a$ c" b/ a  ~! M% B9 f- vThen 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."
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

9 S# @" E! j# q1 ]. [. L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

7 B/ `9 o2 Q; C2 M换成4K 试试？我发现在windows 的磁盘簇大小也仅仅是4K