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raid0 on mechanical drives are useless unless you really need shitloads of storage you don't care about.
raid0 on ssd is almost always overkill for things like OS++, if coming from mechanical drives, a single ssd will feel like a whole new world.
The only downside is that you lose the possibility of using cpu features that are newer than your EVC level. Usually this is no big deal, but for cetain specialized software, it could matter.
SSDs are completely different, and yes, you can't be sure that overwritten data is actually overwritten.
On the flipside, with the new modern garbage collection that actually reads the ntfs headers to get info about what it can delete, you can't recover deleted files either, even if not...
Noone has ever managed a recovery of an overwritten digital magnetic harddrive.
Deleted files are a whole different ballgame, as long as only the filesystem entry and not the actual data has been touched.
Read the links posted above.
Also added the Wright, Kleiman and Sundhar (2008) link:
http://itknowledgeexchange.techtarget.com/security-corner/the-great-drive-wiping-controversy-settled-at-last/
I realize it's not a primary source, but the original site seems to have died.
The presumed author also posts here...
The "recent" researcher you're pointing to is probably the 1996 paper here:
http://www.usenix.org/publications/library/proceedings/sec96/full_papers/gutmann/index.html
He has later posted a comment saying it's no longer possible on newer drives:
http://seclists.org/bugtraq/2005/Jul/464
And you...
This will obviously work, but it has the nasty sideeffect, to potential law enforcement, that it looks like an encrypted disk. And in some countries, it's illegal to not provide the correct encryption keys. (USA and UK being the two major ones from the "first" world I guess.)
So I'd rather...
If I understand you correctly, yes.
When you create a debian vm on the nfs share, it creates a file that represent the vms harddisk, just format it like you would do with any physical debian installation.
This is not true, a non-quick windows format READS the full disk, it does not write anything more than a quick one.
As for wiping, one full overwrite, random or not, is enough.
As mentioned above, merely formatting and using it does not guarantee overwriting, unless you filled the disk...