On his "Data Storage - Dullness becomes Mainstream" blog, Chris Evans is
amazed athow low they can go!
.He compares the latest 100GB Toshiba 1.8" drive designed for portable music players, to the size andweight of older technology, like the IBM 3380 Direct Access Storage Device (DASD).
Chris couldn't find the dimensions of the 3380, so I thought I would provide the missing detail.The IBM 3380 History Archivesprovides a nice summary:
- The CJ2 model that Chris mentions was announced September 1, 1987 and shipped in 1988. Earlier models of the 3380 were announced 1980-1986.
- Capacity and performance were measured in 7-bit "characters", since we were not yet storing full 8-bit bytes.
- By today's standards, having such a large box to hold a few GB might seem amusing, but at the time, this unit was four times the capacity as its predecessor, the IBM 3350 DASD. Compare that with our first disk system, the IBM 350 Disk Storage Unit, introduced in 1956, that stored only 5 million characters (5MB) and was the size of two refrigerators.
- The term "DASD", pronounced daz-dee, was used as some earlier devices were based on magnetic drums or strips of magnetic tape. Today, DASD is still a common term for disk systems among mainframe administrators.
- The 3380 was also twice as fast as the IBM 3350, at 3 million characters per second (3 MB/sec). The irony was thatthe mainframe servers could not keep up, so a Speed Matching Buffer feature was invented to slow it down to half-speed, when used with certain models of mainframe.
As for the dimensions, I too had a hard time finding a publicly available resource that listed 3380 dimensions,so I searched internal IBM resources, and finally, asked someone over in the next building just to measure one ofthe 3380K models we still have in the Tucson test lab floor. The dimensions are ... (drumroll please)
- 70 inches (1778mm) tall
- 44 inches (1117mm) wide
- 32 inches (812mm) deep
The result is that the box could actually hold a much more impressive 52,500 of the new Toshiba drives, twicethe original, albeit conservative, estimate. Before anyone"tries this at home", however, keep in mind that around each Toshiba drive,as with any ATA drive, you need to have all the electronics to communicate to the outside world, and provide cooling. Running tens of thousands of these little guys in the spaceof 60 square feet would probably melt the floor or set off your smoke alarm system.
At least take a backup first.
technorati tags: Chris Evans, Toshiba, IBM, 3380, DASD, CJ2, 3350, ATA