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。

- k; C5 L1 W2 k- z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。
/ s9 e7 s* C' _( b" i
7 h7 p# a  I% Q+ J* ~3 L; x4 s性能的变化太大了，值得引起重视。

9 H/ `+ d) F) g# L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：

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

: O: D6 Y# C  W# x6 `7 @2 O9 }$ B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？
! E/ P6 z4 l5 P% `% N0 h' \; i
) i$ G7 D+ k6 r  C- h4 `* h  r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.

+ c2 ~2 T" G* B0 Z" r卡型号： Transcend 8G SDHC Class 6
: H) P0 ~9 s: I
+ o1 R# T$ |2 n' z& ~# h, }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

[ 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....
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& p: n* ]+ A5 a" J/ s5 B- xformat X: /FS:FAT32 /A:16K
1 `4 x8 m" D* X' Q(or maybe format X: /FS:FAT32 /A:32K)
4 B) S6 H7 D# e$ K- r# s2 {$ s. lwhere "X" is the drive letter.
OR
"Go to "Control Panel" then select "Computer Management."
Under "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.
Select "Format" after you right click, then select FAT32 under "File system" and 32K under "Allocation unit size".
* p9 p9 l+ d9 j2 fMake 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.
Then click OK and you're good to go.
( Y) B7 Z9 x) D- d+ XIt 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."
' B! [+ n' Q, G- A/ wI'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
( P8 D$ J- l9 }1 X. B" u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：
$ P( N3 t2 g' y. O3 s* z
8 B6 T5 _  H1 v3 x. p; P' dFormat k: /fs:fat32 /a:16K
; g% V' |3 E! f6 H# h% X9 R
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

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, q" s0 j& r, R% C, d" J换成4K 试试？我发现在windows 的磁盘簇大小也仅仅是4K