December 2005
Beginner
480 pages
13h 27m
English
Content preview from Linux Server Hacks, Volume TwoBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Hack #94. Recover Data from Crashed Disks
You can recover most of the data from crashed hard drives with a few simple Linux tricks.
As the philosopher once said, "Into each life, a few disk crashes must fall." Or something like that. Today's relatively huge disks make it more tempting than ever to store large collections of data online, such as your entire music collection or all of the research associated with your thesis. Backups can be problematic, as today's disks are much larger than most backup media, and backups can't restore any data that was created or modified after the last backup was made. Luckily, the fact that any Linux/Unix device can be accessed as a stream of characters presents some interesting opportunities for restoring some or all of your data even after a hard drive failure. When disaster strikes, consult this hack for recovery tips.
Tip
This hack uses error messages and examples produced by the ext2fs filesystem consistency checking utility associated with the Linux ext2 and ext3 filesystems. You can use the cloning techniques in this hack to copy any Linux disk, but the filesystem repair utilities will differ for other types of Linux filesystems. For example, if you are using ReiserFS filesystems, see "Repair and Recover ReiserFS Filesystems" [Hack #95] for details on using the special commands provided by its filesystem consistency checking utility, reiserfsck.
Popular Disk Failure Modes
Disks generally go bad in one of three basic ways:
Hardware failure that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.