If you are that concerned about your digital music, and you should be, perhaps what you should invest in is a USB or NAS drive that supports dual drive RAID mirroring.
If one drive fails in the unit you simply replace it and the RAID software takes care of copying the data from the other disk in the background. You can also listen to the music while this is going on.
I have three such units.
- one for general backups of my computer systems
- one for my music
- one for my photo’s
I have had a drive fail on the music NAS, but I was using standard hard drive for desktop computers. So I plugged in a new drive rated for data servers and pressed the ON button - Voila - completely restored !
Now both drives in that NAS are rated for data server use :-)
RAID requires a hard drive that is specifically for data servers- they are more robust and can handle the load RAID places on them. They are not much more expensive than a regular hard drive and provide faster data transfers.
HDD's rated for data servers are running 24/7/365 at server farms and they do fail after a few years, but RAID makes it easy to replace and more importantly recover the data on the failed hard drive.
By comparison - my NAS runs maybe an hour a day - it will last a very long while.
You should also keep an offsite backup just in case of a bad house fire - but that can be kept on a smaller single drive USB unit
As for the choice between solid state and mechanical drives...
- I have been using mechanical "server drives" for around 10 years.
- never experienced a problem - YET :-)
- and they are fast enough for the music I play
Solid state technology can partially fail but the drives have the smarts to recover & block failed memory areas - to some extent. But this too will get better with time
Personally - I will continue with the mechanical drives
- until they disappear from the market place, which could be sooner than later
Hope that helps