Sure it can, just find an 3.5" External Enclosure and decide if you want USB 2 or 3. Like THIS one is probably the one I would get.
Not really any way of telling although most drives that are not super old tend to have SMART technology and will be able to warn you before it dies and telling you to back up your data before imminent drive failure. Also I try to buy drives that have at the least a 3-year warranty. I had a WD drive that had a 5-year warranty and I started getting bad sector wrights and the SMART tech was telling me of drive failure. I was able to back up my data and send the drive in for an RMA even though it was 4-years old.
My suggestion is get a Drobo 5N where you'll have a single disk redundancy so long as you have two drives installed. I just got my Drobo in yesterday and it's bad ass.

Ah k. I will look into that Drobo a bit more but man its expensive!!!![]()
It's the ultimate Raid setup though. 
Yeah I know and then when you tack on three 4GB NAS HDD that's an easy $1000.It's the ultimate Raid setup though.
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Jay if your looking for something extremely portable and with a semi-large storage capacity I would consider this setup. I have this very setup and I have a bunch of portable programs and also some movies too that I ripped from my Blu-rays. I use the USB 3.0 at home but at work we only have USB 2.0 and 3.0 is backwards compatible to 2.0.
The nice thing about a SSHD is you have the caching of a SSD and the storage and price of a typical HDD all rolled into one and housed in a external enclosure that sleek and stylish that's all very affordable.
Seagate 2.5" SSHD
Orico 2.5" External Enclosure
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