When to upgrade the hard drive?
The capacity of hard drives has grown exponentially. In the early 1990s, hard drives were of capacities of 1 gigabyte and greater. As of early 2005, the simple desktop hard disk in production has a capacity of 40 gigabytes. As far as PC history is concerned, the major drive families have been MFM, RLL, ESDI, SCSI, IDE, and now SATA.
The need to upgrade hard disk arises when you have data which is filling up the space in the hard drive at an alarming rate. A normal home based computer with minimum usage like office applications, e-mail and internet requires a hard disk of 4 GB or less than that. 
