Salvaging old disk drives, card readers. etc

Legatta

Reputable
Jan 6, 2016
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So I got given this old Dell PC that's clearly seen better days, I'm gutting it for parts before I chuck it, but I was wondering, is there any danger is taking things like the disk drive and card readers and putting them in my shiny new system? I'm assuming the answer is no but I'm not completely sure so I thought it best to ask.
 
Thanks for the replies, this one might sound silly because it probably is; are DVD Rewriters okay? Like if they turn out to be faulty could they damage the system at all? I don't desperately need them but if it's going spare I guess I may as well keep it.