Typically random access memory (RAM) is the primary storage device and the slower rotating magnetic media (disc drive) is the secondary storage device. Other devices like USB thumb drives and other...
If you are talking about internal storage, the SCSI drive was the first. However, tape drives were used long before that. Many early computers didn't even have a hard drive, instead the data was...
The primary storage device on most computers is usually* the internal hard disk drive defined as the "master" drive. If the computer has only one hard drive, this is your "master" drive. * This can...