[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.

Peter
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