But I would never expect a hard disk to be readable after 100 years either. Flash manufacturers typically list an expected "data retention" time of 10 years, although that can only be a prediction for the current generations of flash memory. No - they need no power to maintain the data. Why not - although a 4GB SD (rather than SDHC) card may expose some compatibility issues depending on what you try to use to read it back in X years time, as it doesn't strictly meet the SD spec. We've seen several occasions where a RAID volume has failed its reconstruction, due to an unreadable block on an otherwise good disk, especially when background scrubbing hasn't been used.Ĭan 4 gig SD cards be used as an additional form of backup? There is also the issue of the degradation of magnetic domains on the disk (which is one of the reasons why all entrprise RAID systems do "background scrubbing" of the disks, as do some modern enterprise disks). corrosion of internal parts, due to the lack of air movement inside the hard disk. There are some hard disk failure modes which can be more, rather than less, likely in some archival situations e.g. I don't agree with everything in the thread, but it gives you some alternative views: Some of this was discussed here recently. Personally, I'd feel more secure with the DVDs - the use of hard disks for long-term storage isn't something I'd do, without regular checks & refreshes of the data. This is in additiion to another backup set on DVD's (although I To an external firewire hard drive which I keep in a bank vault. So low what is the viability of using SD cards as an additionalįorm of backup? I currently backup about 20 gigs of digital photos
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