Removable Memory Planet : Four types of magnetic storage devices in removable memory planet

There are four types of magnetic storage devices in removable memory planet


1. Magnetic storage disk

First type of magnetic storage devices in removable memory planet is magnetic storage disk, a disk is made of a thin piece of plastic coated with magnetic material on both sides. The tracks are arranged in concentric rings so the software can jump from "file 1" to "file 19" without having to fast forward through files 2 through 18. The disk spins like a record and the heads move to the correct track, providing what is known as direct-access.

Removable memory planet : Magnetic storage disk

2. Zip

Second type of magnetic storage devices in removable memory planet is Zip, for many years, magnetic technology has improved greatly because of the low cost of floppy disks and the immense popularity. One alternative that has become very popular is the zip. The main thing that separates a Zip disk from a floppy disk is the magnetic coating used. On a Zip disk, the coating has higher quality. The higher-quality coating allows the read/write head of the Zip drive to be smaller than on a floppy disk (by a factor of 10 or so). Zip drives use a variable number of sectors per track to make the best use of disk space. All of these features combine to create a Zip disk that can hold a huge amount of data (up to 750 MB).

Removable memory planet : Zip drive

3. Cartridge

Third type of magnetic storage devices in removable memory planet is Cartridge. Another memtod of using magnetic technology for removable memory is taking a hard disk and putting it in a self-contained case. One of successful products using this method is the Iomega Jaz. Each Jaz catridge is basically a hard disk, with several platters, contained in a hard, plastic case. The cartridge contains neither the heads nor the motor for spinning the disk.

Removable memory planet : Current jaz drive uses 2-GB cartridge



4. Portable drive

Last type of magnetic storage devices in removable memory planet is Portable drive. Completely external, portable hard drives are becoming popular, due to the USB technology. These units, like the ones inside a typical PC, have the drive mechanism and the media all in one. The drive connects to the PC via USB cable and, after the driver software is installed the first time, is automatically listed by Windows as an available drive.



Removable memory planet : 20-GB Pocket Drive

Another type of portable hard drive is called a micro drive. These tiny hard drives are built into a card called PCMCIA card that can be plugged into any device with PCMCIA slot, such as a laptop computer.

Removable memory planet : Micro drive which can hold 340-MB



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