01-26-2012
It's not guaranteed to not lose data. No system can guarantee that when the disks are busy, the power goes out, and all batteries fail. It means that clear records describing the last few operations and the current operation in progress are kept, so if something goes pear-shaped, you'll know at least know what happened where. This makes recovery easier and faster. ext3, for instance, can recover from a hard-power-off without needing fsck when there were no operations in progress -- the journal's clean, therefore there were no operations in progress, therefore the filesystem ought to be still fine.
Downside is more overhead -- the computer has to keep updating the journals.
Last edited by Corona688; 01-26-2012 at 04:55 PM..
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LEARN ABOUT DEBIAN
testdisk
TESTDISK(8) Administration Tools TESTDISK(8)
NAME
testdisk - Scan and repair disk partitions
SYNOPSIS
testdisk [/log] [/debug] [/dump] [device|image.dd|image.e01]
testdisk /version
testdisk /list [/log]
DESCRIPTION
TestDisk checks and recovers lost partitions
It works with :
- BeFS (BeOS)
- BSD disklabel (FreeBSD/OpenBSD/NetBSD)
- CramFS, Compressed File System
- DOS/Windows FAT12, FAT16 and FAT32
- HFS and HFS+, Hierarchical File System
- JFS, IBM's Journaled File System
- Linux ext2/ext3/ext4
- Linux Raid
RAID 1: mirroring
RAID 4: striped array with parity device
RAID 5: striped array with distributed parity information
RAID 6: striped array with distributed dual redundancy information
- Linux Swap (versions 1 and 2)
- LVM and LVM2, Linux Logical Volume Manager
- Mac partition map
- Novell Storage Services NSS
- NTFS (Windows NT/2K/XP/2003/Vista/...)
- ReiserFS 3.5, 3.6 and 4
- Sun Solaris i386 disklabel
- Unix File System UFS and UFS2 (Sun/BSD/...)
- XFS, SGI's Journaled File System
It can undelete files from
- DOS/Windows FAT12, FAT16 and FAT32
- Linux ext2
- NTFS (Windows NT/2K/XP/2003/Vista/...)
OPTIONS
/log create a testdisk.log file
/debug add debug information
/dump dump raw sectors
/list display current partitions
SEE ALSO
fdisk(8), photorec(8).
AUTHOR
TestDisk 6.13, Data Recovery Utility, November 2011
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
2011 November TESTDISK(8)