Greg Freemyer wrote:
On Tue, Nov 4, 2008 at 1:08 PM, Mark Lord <liml@xxxxxx> wrote:
..
Mmm.. never thought about that much before now,
but DCO is a nifty way to hide much of a drive from prying eyes.
Eg. Use DCO to restrict the drive to LBA28 accessible sectors
and also turn off LBA48 support, and then a lot of space becomes "hidden".
Until now!
Yeah, combine that with some HPA shenanigans and you can create two
complete disk partition layouts on one drive.
ie. Two partition tables, the normal partition table for the first 128
GiB is in sector 1. The partition table for the rest of the disk is
at sector 128 GiB + 1. Then use DCO to totally hide the upper section
of the drive.
When you want access, use DCO commands to expose it, and then HPA
commands to make only the sectors beyond 128 GiB accessible.
..
Now that one has me stumped. The only HPA commands I know of,
permit setting only the maximum-LBA, not the minimum.
Or is this a newish ATA9 (or last-minute ATA8) sort of thing ?
..
to the end of the disk, then issue a "hpa swap" command. That will
hide the first 128 GiB and expose the rest of the disk.
..
Yeah.. what's this "hpa swap" ? Possibly a vendor-specific op, perhaps?
Cheers
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