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This USB driver has two partitions, one is ext3 and another NTFS. Now I want to convert the ext3 partition to ext2, is it possible?

The partition has around 200G data and I have no spare disk or space to temporarily store that.

  • You can mount ext3 filesystem with ext2 driver, you do not need any conversion. – sebasth Oct 3 '18 at 7:04
  • @sebasth, I have to convert it because this driver will be used sometimes on Windows PC, and the program for reading linux file system in Windows doesn't support mount ext3 as ext2 – Edward Oct 3 '18 at 7:08
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Simply remove journaling:

# tune2fs -O ^has_journal /dev/sdbX
# fsck.ext2 /dev/sdbX

Then you can simply remove .journal file.

  • Can ext3/ext2 store acl and other extended attributes? If yes, should we care about that? – 炸鱼薯条德里克 Oct 3 '18 at 7:05

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