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Old October 7th, 2011, 12:32 AM   #1 (permalink)
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Default Info about EXT and partitioning?

Every time I customize a device, I most likely will come across the "Partition SD/Memory Stick Duo". I never really thought about until now, but what exactly is this? Even more so, I notice that i can choose an amount of MB(a2sd) and place anything from the Dalvik to an app on it, which leads into my next question: What is EXT? Any info is appreciated and thanks in advance

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Old October 7th, 2011, 04:02 AM   #2 (permalink)
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EXT is a filesystem like FAT32/NTFS
EXT2/3/4 are usually used in Linux/androids

ext2 is fast but lacks journal-ling so fsck should be done time to time

ext4 is slower but has journals (I think) and is much more advanced .fsck is faster in ext2

There are also xfs , JFS(Preferred for /data,/cache ) ,reiserfs (faster read ,ideal for /system).

Research from debian-administration.org






BTRFS is Fastest but is CPU hungry in turn it affects battery .It''s better than JFS. Very nice for second SD card partition (Currently using)

Reiser4FS is closely related to BTRFS and has almost equal performance .It has faster Read rate making it ideal for ro /system

JFS is ideal for /data and /cache since it has slower read than reiserfs but way faster write than reseirfs .It has the least cpu usage in all FS.

Currently I am trying to see xfs instead of btrfs and see it's impact .


ReiserFS ,BTRFS ,XFS,JFS,ext2/3/4 all need to fsck to function properly .

Hope this helps

Edit

Forgot about partitioning .
you will need mkfs binary for formating in /system/bin folder or symlinked to busybox
Like
mkfs.ext2, mkfs.ext3, , mkfs.vfat, mkfs.xfs, mkfs.jfs and so on
usually second SD partition is /dev/block/mmcblk0p2

for ext2
mkfs.ext2 -m 0 -b 4096 /dev/block/mmcblk0p2
should do the trick .

Gparted partition wizard for ext2/3/4

or mini tools partition wizard /EASEUS for windows ext 2/3/4 partition .
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Last edited by Tresezk; October 7th, 2011 at 05:03 AM. Reason: Add format options
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Old October 15th, 2011, 08:26 AM   #3 (permalink)
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Quote:
Originally Posted by karandpr View Post
Gparted partition wizard for ext2/3/4

or mini tools partition wizard /EASEUS for windows ext 2/3/4 partition .
See signature to see how much I agree with you
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Old October 15th, 2011, 09:42 AM   #4 (permalink)
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Haha ,
I am currently using fdisk and busybox-mkfs combo batch script .
Ok I am lying ,Only the mkfs batch script .I dont have enough patience to reformat my SD card
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Old October 16th, 2011, 06:12 PM   #5 (permalink)
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Thanks for the info. I have alot to do lol
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