C.H. Hard Drive (What Is This)

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The Hard Disk Drive (HDD) is the main secondary storage device used to permanently store information and consists of one or more magnetic disks contained in a box. An important function of a HDD is to store program files. When you purchase a new program, you need to install the program files to the HDD before you can run the program. Most programs will not work unless they are properly installed on the hard drive.

Speed –disk can spin much faster, thousands of RPM (revolution per minute). As a result of higher recording density and faster spinning, hard drive can write and retrieve information much faster.

The hard drive is connected to a disk controller with a cable. The hard drive can be connected by Enhanced integrated Drive Electronics (EIDE), and Small Computer System Interface (SCSI), pronounced “scuzzy”, connections.

EIDE is an improvement in transfer speed of the IDE, since it is typically connected to the system motherboard. The EIDE interface supports up to four drives, a master and slave on each of two channels. The intermediate PIO (Programmed or Processor I/O) modes and DMA (Direct Memory Access) modes used by EIDE and FAST-ATA are big performance boosters. Ultra DMA (also known as Ultra ATA) data transfer of 33 MB/S (megabytes per second) or 44MB/S or 100MB/S.

SCSI is a high-end controller system, where the units are connected to a special controller, which is rather expensive.

New Hard disk has more than 40GB (Gigabytes) of capacity and Ultra ATA/100 and 7200rpm (revolution per minute) spindle speed.