BACK to DASD
|Mus.Cat. NEWUC:2007.13||Mnfctr: Tandon||Date: 1987||Model No: TM383||-|
|Comp: Disk Drive||LENGTH: 145 mm||WIDTH: 100 mm||HEIGHT: 39 mm||Weight: 721g|
This is a Tandon TM383 disk drive, I do not know its capacity, or year of manufacture.
I am guessing about 1980. Can you tell me better, please?
Richard Brooks from Vickers Armstrong responded:
"I have just opened one of my old Tandon Data-Pac enclosures and the front of it is marked as 30Meg.
Assuming the drive arm stepper unit is of around the same date as the drive enclosure
the paper stamp on mine has DATE: A27-87."
Many thanks Richard
Also had from Tom Gardner: (I have not edited his email it cannot be bettered.)
BTW, the Tandon TM383, at http://www.staff.ncl.ac.uk/roger.broughton/museum/DASD/200713.htm is probably the drive mechanism taken from inside a Tandon Data Pac. A data sheet is attached. Tandon sold its HDD business to Western Digital in early 1988 retaining the Data Pac rights. The stamp "7288" on the pcb suggests to me the board was manufactured in the some time in 1988; this is consistent with the A40-87 marking on the stepper motor being manufactured earlier than the board. The Data Pac was announced and shipped in late 1986 According to records such as Disk/Trend, Tandon never sold a TM383 as a separate product. Their last 3½-inch products were the: TM344 2 disk 42 MB TM346 3 disk 62 MB TM362R 1 disk 21 MB TM364 2 disk 42 MB All four products share the same mechanism and it looks very much like the mechanism in your pictures. All four are RLL specified as is the Data Pac. Comparing the specifications, its pretty clear that the TM383 is a TM344 operated at a lower track density (804 tpi vs 1013 tpi) to get the lower 30MB capacity. (all capacities formatted) So if I were u I would change the catalog listing to Data Pac, the year to 1986, and the msec and MB/sec per the spec attached. Then note in the text that this is the drive mechanism from a Tandon Data Pac, labeled TM383 internally and similar to the TM344 Tom
He even provides a data sheet for the disk drive.
This is the underside.
It is a printed circuit board with all the micro circuitry to make this a complete disk drive.
In the front is the stepping motor which is a brushless, synchronous motor
that divides its revolution into steps.
The drive has two disk platters, 94mm diameter, four heads with 22mm of travel.
The motor turns a pinion that engages with a rack that is part of the head assembly.
You can just imagine the effect of wear on the accurate positioning of the head assembly,
not to mention it is a linear/radial movement with no servo surface so temperature changes
that effected the head assembly and disks would have been additive, not cancelling.
This is a close-up of the head. It is not a thin film head, you can see the copper wire coil.
An end view of the head shows it is quite sophisticated, with two broad outriggers and a central hull with the R/W head.BACK to DASD