can I install a different O.S. on this drive than what is on my computer?

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Accepted Answer

I'm not really sure because I got this for the backup purpose
for Mac air.  It's been working fine so far.
For the OS installation, I think it will depends upon your PC
because sometimes old one does not support any boot from the 
external hard drive.  So you should check your BIOS first to make
sure that your pc can support it.

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