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Living Room / Re: What is safer for data -- a hard disk or a blue ray disc?
« on: July 08, 2013, 01:37 PM »
I've *read* lots of stuff about limited lifespans of DVD-R (and by extension, I guess) BD-R discs. But in practice, I occasionally read archives from 10 years ago without problems.
I prefer to do this via hard drive for really big amounts of data, because chopping up the archives, and figuring out what's on what disc, is a big pain. Actually, I just bought a cheap large drive for an additional backup of my photos and documents, when I move in a couple of months - I'm worried about what a hot moving truck will do to hard drives, so I'll carry this one with the real crucial stuff with me.
Continuing to argue with myself... setting aside the life of optical bits versus magnetic bits, there's also long-term questions of form factor. My bet is that you'll have a device that can read optical discs longer into the future than you'll have a device that accepts the kind of interface on your hard disk. I mean, CDs and DVDs have been around quite a long time, and readers are ubiquitous. But if you had your data on an IDE or (some kinds of) SCSI hard drive, and you'd have a much more difficult job trying to find a reader.
MWB1100 reference parchives (like PAR2) above, which is one way to add redundancy so that small failures are recoverable. Another approach, if you're using optical discs, is to use DVDisaster. This is essentially the same thing as PAR2, but it's hidden outside the file system for transparency, and operates against the entirety of the disc image.
I prefer to do this via hard drive for really big amounts of data, because chopping up the archives, and figuring out what's on what disc, is a big pain. Actually, I just bought a cheap large drive for an additional backup of my photos and documents, when I move in a couple of months - I'm worried about what a hot moving truck will do to hard drives, so I'll carry this one with the real crucial stuff with me.
Continuing to argue with myself... setting aside the life of optical bits versus magnetic bits, there's also long-term questions of form factor. My bet is that you'll have a device that can read optical discs longer into the future than you'll have a device that accepts the kind of interface on your hard disk. I mean, CDs and DVDs have been around quite a long time, and readers are ubiquitous. But if you had your data on an IDE or (some kinds of) SCSI hard drive, and you'd have a much more difficult job trying to find a reader.
MWB1100 reference parchives (like PAR2) above, which is one way to add redundancy so that small failures are recoverable. Another approach, if you're using optical discs, is to use DVDisaster. This is essentially the same thing as PAR2, but it's hidden outside the file system for transparency, and operates against the entirety of the disc image.