Sometimes you can tell by looking in Device Manager.
Get the model number & look it up on the manufacturer's website.
But you can also physically look at the drives.
A SATA drive is connected to the board with a small cable and the connector
is about 1" wide; a PATA/EIDE drive is connected by a cable with a connector
more than twice as wide.
Having a SCSI except in a server would be a little unusual, but they have
several formats of cable, all over 1.5" wide.
An external drive is most likely PATA/EIDE in a USB enclosure.
"Robert" <(E-Mail Removed)> wrote in message
news

CBD8757-36BB-4A42-B305-(E-Mail Removed)...
> Can someone please tell me how I can conveniently determine whether my
> internal hard drive and my external hard drive are ATA or SCSI or some
> other
> dsignation? Thank you
> --
> Robert