[Top][All Lists]

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

Re: [Bug-ddrescue] How to restore just a single parti tion of a multi-pa

From: Shahrukh Merchant
Subject: Re: [Bug-ddrescue] How to restore just a single parti tion of a multi-partition image file?
Date: Fri, 25 Jan 2019 11:24:16 -0300
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Thanks David, your response, as well as Timothy's response to my question as to why use the NTFS tools for a partition-based copy, allude to the difference between a partition-based clone (sector by sector copy) vs. a file-system based clone (file by file copy).

For backup recovery purposes, I'm very skeptical of file-based "clones" because any number of utilities have subtle problems in copying (e.g., files with super-restricted permissions such as ownership by "Trusted Installer," very long full pathnames, odd characters in the file names, etc.). I have been bitten by this more than once. I stopped using Norton Ghost about 10 years ago just because of this: I couldn't open their proprietary (yet another problem) backup file format in their restore utility because ONE file had a filename that exceeded some length. I moved on to Image for

On 2019-01-24 4:54 AM, David Morrison wrote:
I think you might be making this too hard, but I am writing this from a Mac user perspective where if it was a Mac disk, this is what I would do. I imagine similar tools are available for Windows.

The first thing you would do is to mount the disk image of the failed disk so it is visible as a file system. This would typically mount the partitions on that disk image individually. Preferably you would mount them read only, and there are ways to do that through the command line on Mac or a utility called Disk Arbitrator.

Having got the partition I wanted accessible from the file system, I would then Restore it to the correct partition on the new disk using Disk Utility. (Clonezilla should be able to do this too.)

The advantage of this technique over ddrescue is that you are not copying block-by-block to the new partition, complete with any weirdness that contains. Instead you are copying as files, which will copy to the full new partition rather than just the first 200GB that ddrescue will copy to. It would also set up boot blocks, etc as they need to be to be bootable.

This should also clear up any damage to the filesystem, if it can repair it. But ofc if the C drive is very damaged as you suggest, then you have to wonder whether it will be capable of doing anything afterwards.



reply via email to

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