Re: using parted

["Robert G. (Doc) Savage" <dsavage@peaknet.net>]

Mike,

You may have missed my original post. There is nothing wrong with my
partition table. I do not need to use dd.

What I need to do is use parted to shrink an existing primary partition
to make room for another. That new fourth partition will receive the
present contents of the /pub directory, and will be mounted to /pub.
While these two layouts will be identical in normal use, in the new one
/pub will not be destroyed when I do a fresh installation of RH8.

The problem is there is stark disagreement in the units of measure for
Start/End and start/end as used by fdisk and parted, respectively. The
former are linear coordinates (block or cylinder numbers), while the
latter are storage volumes (megabytes).

If you know of some other tool that performs the same resizing function
as parted, please advise.

--Doc

On Sun, 2002-11-10 at 10:29, mike808@users.sourceforge.net wrote:
> I found some tools that help. There's a "ext2salvage"  project out there.
> I don't trust it on the re-write part, it hasn't been worked on in over a year,
> and the author says the write part is broken.
> See http://project.terminus.sk/e2salvage/
> 
> Then there's the *windows* application from R-TT.com that actually looks pretty
> good.
> 
> http://www.r-tt.com/RLinux.shtml
> 
> My situation is similar. I hosed the partition table, and since I can't
> get that "quite right", I can't recover the superblocks in the partition.
> Unfortunately, this is a 100GB drive, and the partition in question is 80GB.
> So simply copying the drive or the partition isn't an option.
> 
> Steve's partition recovery tool came close, and it's results matched the RLinux
> results as well.
> 
> I also found a nice read-only partition/superblock/ext2fs finder called
> scandrive.cpp.
> See http://www.unixwiz.net/techtips/recovering-ext2.html
> 
> I've modified it here to dump the entire superblock for any it finds.
> This should help in figuring out which SBs are "real" and which ones are
> completely bogus. The RLinux tool gives much of the same information but with a
> nice GUI.
> 
> I think the consensus is to use dd to pull a particular sector on the disk,
> use a hex editor to "patch" it, and then dd to re-write it.
> 
> Obviously, everyone recommends using dd to grab an image of the partition or
> disk in question, and then do your editing on *that*. Use the loopback device to
> mount the file as a disk and then see if everything is back in its place.
> 
> HTH,
> Mike808/
> I feel your pain.
> 
> 
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> 
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