I read that usage of a btrfs volume with a newer kernel can render it unreadable when that same volume is used with an older kernel. I have a mobile storage device that will be used by different linux distributions and kernels. What are the kernel version incompatibilities I might have to worry about? The machines I will use have kernel versions 3.2.0, 3.5.0, and higher.

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    This is really something to ask on a btrfs mailing list. btrfs was only announced as no longer unstable very recently, after any of the kernels you mentioned. Potentially using anything before this announcement could cause issues. – Graeme Feb 26 '14 at 20:02
  • Don't use kernel-version dependent filesystems on moveable storage... VFAT is standard in the area for a reason ;-) – vonbrand Mar 3 '14 at 13:40

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