[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Bug-ddrescue] Rescueing Dell HDD

From: Katona Gábor
Subject: Re: [Bug-ddrescue] Rescueing Dell HDD
Date: Mon, 10 Oct 2011 16:02:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110907 Thunderbird/6.0.2

  Hi Chris,

First STOP! I think (I know) you are really lucky with ddrescue dropping error messages and stopping. Your trials could have ruined all data (really and unrecoverably) on your external drive, so stop before understanding at least the basics.

When dealing with disks and partitions ddrescue can save a whole disk, partition or file, or a given part of it. The main point is that ddrescue can only save parts what you define. It doesn't know anything about your filesystem, it only sees the drive or partition as a sequence of bytes. This is the power of ddrescue, and in some sense the weekness of it. *If your drive is accessible from e.g. a live Linux disk (I guess it is), copy all your data to a safe place first!* After this you can install a new system and copy back your data. Alternatively if you want to clone your disk to another one, to use it as it was before, togther with dell hidden partitions, you can use ddrescue, but for this, you need a drive with capacity for the whole disk or partition. ddrescue cannot determine which part of the disk is in use by your data (and you also cannot do that), it will copy everything. Of course compression on the fly is possible, but no one can predict the compression ratio of your disk, so it may not fit in the 70Gb free space on your external drive, but you can try.

If your drive has no errors at the moment, you may not need ddrescue at all. ddrescues main strength is recovering data from disks/files with errors, effectively skipping them for saving most of the data first, than turning to the problems. Of course it is also extremely suitable for exact cloning, but you can have a look at partimage[1] or partclone[2] to copy only the parts that are in use.

You have to choose which method you want to try, but first, save all your data simply by copying with a live CD if possible. If after this you choose ddrescue to make exact copy of your drive, here you can get answers on how to do that with or without compression.



[1] http://partclone.org/
[2] http://www.partimage.org/

reply via email to

[Prev in Thread] Current Thread [Next in Thread]