Hard drive
A high-capacity, self-contained storage device containing a read-write mechanism plus one or more hard disks, inside a sealed unit.
A magnetic disk on which you can store computer data.
A single hard disk usually consists of several platters. Each platter requires two read/write heads, one for each side. All the read/write heads are attached to a single access arm so that they cannot move independently. Each platter has the same number of tracks, and a track location that cuts across all platters is called a cylinder.
Some important elements in hard drive operation include zones, tracks, sectors, servo system, and variable density. Inside the hard drive information is stored on platters and it’s written by heads while platters are spinning.
Modern drives use an embedded servo system which means the servo system information is located on all surfaces evenly. Servo System data can be written only at the factory and cannot be fixed or re-written during drive’s regular use.
