An internal sealed storage device for each PC is called a disk drive or hard drive this device is used Insulator And Conductor to save data by the use of rotating plates that can be magnetized and later scanned to retrieve data.
The term drive is talking about a motorized aspect that is unique to its medium, as in tape drives. Early on storage drives were removable devices though today it’s considered a sealed unit.
The ACS I and IDE drives were earlier interface types. They were fairly difficult to install more than one drive at the time. They relied on a master slave ribbon cable, if he had more than one unit installed would have to have one as a master one is a slave and sometimes that involved placing jumper the ends on the back of the drives accordingly.
Newer drives use an interface called serial ATA. This interface is the same size as the IDE but it moves data more like the SCSI did minus the large size and high heat. Another plus for the serial ATA drives is you no longer have to mess with jumper settings. In the past to install more than one hard drive he had to plan out a master slave jumper setting.
All hard drives use a material that is ferromagnetic to save their data on.
There is an actuator arm for each plate on the spindle that moves the read write head across the platter which lets each read write head access pretty much the entire surface of the platter as it spins. The surface of each platter is divided into small magnetic regions each single region holds one binary number a one or zero.
In newer present-day drives their smaller sizes of magnetic area makes them susceptible to heat damage which may cause them to lose data. But HDs have a security policy for this is called a smart disk check. He counts the number of errors Electrical License Practice Test in the hard drive and compares that to the total number of repairs so that it can predict its own failure. If a hard drive failure is predicted you should be told ahead of time to replace your drive before you experience data loss.

By Master