Help! Multiple Hard Drives with Identical UUIDs!

OK, i've been having a lot of problems lately with backup software (superduper! and time machine in particular), as well as itunes, where the apps seem to be confused about which external hard drive is which.  this has had messy and in some cases disasterous results.  after digging around a bit, i've discovered that an external hd (western digital 2t) connected directly to my mac, as well as three other hds (all western digital 2t drives) connected through a hub (anker usb 3.0 powered hub), have identical uuids.
anyone know why this happens?  and what i can do to correct it?
thanks!

markmal wrote:
OK, i've been having a lot of problems lately with backup software (superduper! and time machine in particular), as well as itunes, where the apps seem to be confused about which external hard drive is which.  this has had messy and in some cases disasterous results.  after digging around a bit, i've discovered that an external hd (western digital 2t) connected directly to my mac, as well as three other hds (all western digital 2t drives) connected through a hub (anker usb 3.0 powered hub), have identical uuids.
anyone know why this happens?  and what i can do to correct it?
thanks!
As R C-R says I posted about this in the Level 6+ forum a few months ago.
I think all you can do for now is reformat prior to using them - I didn't notice until each one started being used as a Time Machine Backup when I'd only intended the first to be used for that.
You may wish to contact WD support - I nearly did at the time but didn't as you seemed to need to register to contact them and I was looking for a more straightforward contact method.
AC

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