Solid-state disks are wonderful things: quick, power-efficient, and mechanically robust.
But it’s worth noting that you shouldn’t use them for archiving data on a shelf, unless you keep them provided with power.
This KoreLogic blog post discusses the problem in terms of preserving legal evidence, and notes:
For client application SSDs, the powered-off retention period standard is one year while enterprise application SSDs have a powered-off retention period of three months. These retention periods can vary greatly depending on the temperature of the storage area that houses SSDs.
Now, I haven’t had a very good track record from my spinning drives in general, and I assume that any data on them is probably ephemeral unless they are in a RAID array. All of my computers use SSDs internally now.
But for offline archiving purposes, old-fashioned hard drives are definitely better.
Thanks to Charles Arthur for the link.