It depends usability and situations. so the lifespan of portable hard disk is vary.
Most hard drive last 3-5 year with normal use, if it's with a portable the will depend if the portable is being moved alot or encounters vibrations frequently.
A portable hard disk is in an enclosure it gets hotter than when it is mounted in the pc. So it can decrease the lifespan. I bought a 500gb external drive and used it for backups and it died in 3 months.
Answered by
jaivir
at
6:28 PM on July 15, 2008