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Filesystems, Disks and Memory
Issue available disk space while using xdd
Post 302355081 by Corona688 on Monday 21st of September 2009 11:35:56 AM
09-21-2009
I'm fairly sure you're not supposed to run xdd on a mounted filesystem(or any data you care about)! My suspicions were raised the instant I noticed it took a device file instead of a mount path. The system will let root write to the partition raw with no regard to any filesystems. I've seen similar things happen when I accidentally ran mkswap on a mounted filesystem... Suddenly, minus 64 exabytes free. 
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LEARN ABOUT DEBIAN
local-filesystems
local-filesystems(7) Miscellaneous Information Manual local-filesystems(7) NAME
local-filesystems - event signalling that local filesystems have been mounted SYNOPSIS
local-filesystems [ENV]... DESCRIPTION
The local-filesystems event is generated by the mountall(8) daemon after it has mounted all local filesystems listed in fstab(5). moun- tall(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with other activity. This event is typically used by services that must be started in order for remote filesystems, if any, to be activated. Remember that some users may not consider it wrong to place /usr on a remote filesystem. For most normal services the filesystem(7) event is sufficient. This event will never occur before the virtual-filesystems(7) event. EXAMPLE
A service that wishes to be running once local filesystems are mounted might use: start on local-filesystems SEE ALSO
mounting(7) mounted(7) virtual-filesystems(7) remote-filesystems(7) all-swaps(7) filesystem(7) mountall 2009-12-21 local-filesystems(7)