하드 디스크 드라이버 ( Hard Disk Driver )

Hard Disk Driver is the program to control Hard Disk.

As the upper picture, Hard Disk is consist of "Platter". Platters' circle is called "Track". The invariable part of Track is called Sector. This is the smallest unit of Writting in Disk which is usually 512 Bytes.
There are two modes to access Hard Disk. The first one is called "CSH Mode", the another one is called "LBA Mode( Logical Block Address )".
The former one has the limitation of capacity( 528 MB ). Controlling Hard Disk using Sector 6-bit, Head 4-bit, Track 10-bit and one sector is 512-byte. Therefore, The max capacity which is capable of being controlled is 528MB( = 2^20 * 512-byte ). But the latter one is not. It sees Hard Disk as a group of linear sector. it could be controlled as long as knowing the total number of sector of Hard Disk.