Skip to main content

Recover Corrupt GZIP Files

It is possible for gzip'ed files top become corrupt and the normal means of extracting the archive will fail. This is especially disconcerting when you are trying to restore from a gzip'ed backup.

Fortunately, the Gzip Recovery Toolkit (gzrt) can offer some hope. It may not recover all your files, but if you are facing this dilemma, anything can be a help.

Mageia6 does not provide gzrt, but it was available for Mandriva 2011 and can be downloaded here for the 32-bit version and here for the 64-bit version. No dependencies are needed to install it, but it will complain about having an invalid signature; I chose to ignore that and proceed with the installation. The installed binary is /usr/bin/gzrecover. A man page and documentation is provided. The dependencies of cpio and libzlib should already be installed on your system by default.

To use, simply launch gzrecover with the corrupt file name as the argument. The output will be a file with the same name with .recovered appended to it.

That should be enough, but if you have a *.tar.gz archive, GNU tar will choke on the corrupt file. To get around this annoyance, you can use cpio to extract the recovered file.

The GZIP Recovery Toolkit homepage provides additional information as well as the following example.

$ ls *.gz
$ my-corrupted-backup.tar.gz

$ gzrecover my-corrupted-backup.tar.gz

$ ls *.recovered
$ my-corrupted-backup.tar.recovered

$ cpio -F my-corrupted-backup.tar.recovered -i -v


And like magic, there are your recovered files.

RESOURCES

GZIP Homepage

GZIP FAQ

GZIP Recovery Toolkit  Homepage

CPIO Homepage



Comments

Popular posts from this blog

DOS4GW.EXE Version 2.01a and Alternative DOS Extenders

DOS4GW.EXE
The TenberryDOS extender DOS4GW.EXE was used by many early DOS games. I still enjoy playing many of these games and DOS4GW.EXE is usable with DOSBox, so they can be played on Linux.

However, the version of DOS4GW.EXE that was included with the game was whatever was current at the time. The most recent version that includes many bugfixes that possibly affected the games when used with DOSBox have been fixed in the latest version, 2.01a.

It's not free at US$49, but you can downloaded it here. Simply substitute it for whatever version of DOS4GW.EXE your game provided and enjoy the bug-fixed goodness. Tenberry also makes a "high-performance" "pro" version of DOS4GW.EXE, but it costs $300. I think that they could sell quite a few of these to hobby users (since, you know, DOS is dead) for US$5.

Open Souce to the Rescue
There are better performing, free and Open Source alternatives available and worth a look.

DPMI Explained
But first, let's understand w…

Fixing a Buggy ACPI BIOS Updated for Windows 8 and Linux Kernel 3.x

In the BIOS, there is a table that configures/determines a number of hardware values for ACPI and your system to use.

One of the features of ACPI is that the values and methods used can be differentiated at boot time depending on what OS you run. Each version of MS Windows has a unique identifier and while Linux can identify as "Linux", the Linux ACPI gurus have decided that Linux will always identify itself as "Windows NT". Even if you force Linux to identify itself as Linux, the Linux ACPI code still lies to the BIOS, except for the computers specifically listed in drivers/acpi/blacklist.

If you are running very new hardware intended for Windows Vista or Windows 8, you might get better performance on ACPI-related issues if you identify, or "spoof", your Linux OS as Vista or Windows 8. This is done by adding the boot-time kernel parameter of acpi_osi="Windows 2006" or "Windows 2012" respectively (and the quotes are necessary). still,…

Mageia

The first release of Mageia 1 is out. You can download it from here and read the release notes here.

If you've used Mandriva Linux, you'll feel right at home with Mageia. Mandriva has always had a reputation of working well for both the novice user and the power user. Installation is typically easy and hardware support is among the best of any distro. The user and administrative tools are comprehensive and easy to use. Of course, under the hood, it's all Linux and all configuration files are plain text files and all a competent administrator needs do is to choose a shell and a text editor.

Mandriva has also been known for excellent default fully-featured configurations of the KDE, GNOME, XFCE and LXDE desktop environments as well as a broad range of available applications. Mageia is no exception in this regard.

For the average user, the changes are mostly cosmetic. The Mageia art, colors and graphics are very well done (and contributed by the Mageia user community). But …