Well for a number of reasons:
IOMEGA Corporation gives a number of reasons for having "removable" hard
drive capacity, and other companies seem to agree with them. Some of the
reasons you might want a high capacity, fast access, removable device are:
Lets assume that I, for instance, do a lot of work at home. A miracle. I
need to transport files that I worked on at the office to finish at home.
What is a cheap method, one that is transportable, and will pay for itself?
Well, floppies are not the solution, and copying over a network is often
not available, and often, the hard disk on a computer cannot accept up
to a gigabyte, or more, of additional files!
High capacity external devices can solve these problems, and they have
access speeds that can rival the speeds of hard disk drives! I can have
cartridges that range from 100MB to 1.5GB, depending on the type of device I
purchase. The device can accept cartridges that are nearly the same physical
size as a 3.5 inch floppy, but with hundreds of times the capacity. The device
(drive) itself is portable, and has either parallel interface, or SCSI
interface. Excellent reasons for buying one.
The manufacturer of "JAZ", "ZIP", and "DITTO" (trademarks registered
Iomega Corp.) drives is "IOEMEGA, INC". SyQuest Technology Inc produces
a competitive product (called 'SyJet') with 1.5GB cartridges. The SyJet
was shipped to retailers in the internal SCSI version in January 1997.
IOMEGA's products are the most well known. The JAZ drives
normally cost $500.00 or less, and the cost of each JAZ cassette
is now under $100.00 per 1 GB of storage. The suggested retail price
of the SyJet 1.5GB internal SCSI drive devices was $399 and $499 for the
external, portable version.
Regardless of the vendor you choose, the purpose is to add "additional,
endless, portable, high-speed storage" to a computing system. These
devices have a 10-12 millisecond seek time and burst transfer rate of
10MB/second.
Courtesy IOMEGA Corp.
The JAZ drive (as shown) is attached to an expansion card in one of
your PC's expansion slots. It accepts a 1 GB cartridge, diskette, (or
whatever you choose to call it) that costs less than $100.00. This
diskette holds data that can be inserted into the JAZ drive and read or
written to. It is somewhat like inserting a large diskette, that it can
be written to at any time.
A JAZ drive holds a larger amount of storage than a CD-ROM, and you do not have
to have a special CD-ROM device to be able to record from your PC. JAZ drives can
be written to at any time. Actually, write-enable CD-ROM drives have
been available at virtually the same cost as JAZ drives, and the individual
diskettes are actually cheaper. However, writing to a CD-ROM is a one-time
operation, which has not mastered the art of multiple writes, in a random
fashion. Once written, often read, but not overwriteable. Tough. Along
comes the ZIP and JAZ drives, which behave much as a 3.5 inch diskette.
Selling point.
One primary selling point of JAZ drives is that they now have "near" Hard
disk access time (10-12 millesec seek time), and data transfer rates!
JAZ drives have 1 GB capacity cartridges, which cost $100 dollars or less per 100 MB
cartridge, and they are as portable as a CD-ROM and are rewriteable! Excellent
characteristics.
The SyJET is very much like the JAZ in capabilities; however, it has a 3.5 inch
Winchester Removable cartridge that holds 1.5GB or 50% more than a JAZ drive. It
costs about the same, and comes in three initial configurations: internal SCSI;
external portable SCSI, and external parallel port configurations.
It can be purchased as SCSI II compatible. An "internal enhanced IDE
version will be available in 1997. SyJet, with its greater capacity and
near same cost, wins the Megabits per dollar war with IOMEGA.
ZIP Drives are similar in appearance to JAZ drives; however, their
capacity is usually limited to 100MB, or about 1/10th of a JAZ drive.
Of course, they are much less expensive.
ZIP Drive Advantages are:
A "ditto" drive as pictured is a streaming cassette tape drive. It is
an excellent device for backup of your hard drives. It has a relatively
high capacity of 2.3GB per tape.
The cost is relatively low, and it has a SCSI or a Parallel interface.
It writes at a speed of XXXX MBPS.
SITUATION BENEFITS
Any Situation Backup/Archieve
Not Networked Share Data
Need HardDrive Space Share data, low cost.
Need HardDrive Space Less Network Traffic
Need HardDrive Space More space per dollar
Mobile Files Yes, if not networked.
Upgrading PCs Yes - extends life of PC.
Data Security Yes - Available when needed.
There are multiple vendors of external, high capacity storage devices
that can be used as high speed storage devices, backup devices, etc. I
will concentrate primarily on devices manufactured by IOMEGA Corp.; however,
SyQuest Corporation and 3M Corporation also produce these high quality devices.
Some information about ZIP drives:
Storage Device Menu