Messages in this thread |  | | Date | Mon, 11 Dec 2000 22:03:43 -0600 | Subject | Re: e2fs block to physical block translation | From | Peter Samuelson <> |
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[Al Peat] > Quick question about blocks: > > If I assume my hard drive uses 512 blocks, and my > ext2 filesystem uses 4k blocks, can I assume the > following formula for translation? > > physical block # / 8 = e2fs block #
Not if you have a partition table. If you take into account the individual partition offset, I think your formula is ok.
On a floppy (no partition table) you'd be fine.
It's not always that easy, of course. Think of RAID (logical block mapping can be a complex formula), LVM (the mapping is stored in a table in the volume group metadata), CD-ROMs (what exactly do you mean by "block"...?) and other such.
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