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|Mus.Cat. NEWUC:2004.27||Mnfctr: IBM||Date: 1973||Ser. No: -||Model: -|
|Comp: Disk Read/Write head.||Length: 127mm||Width: 20.5mm||Depth: 17mm||Weight: 19g|
The 3330-II disk drive was very similar to the 3330-I
except that it almost doubled the track density from 8 to 15 tracks/mm
The disk heads were similar, as were the disk packs, but they were different,
you could not mount a 3330-I disk on a 3330-II drive and visa versa, it was mechanically impossible.
This is the cardboard storage container.
The labelling on it is interesting:
MODEL II MODEL I  P/N 2 345 270 A UP  P/N 2 275 135 A UP  P/N 2 345 271 A DOWN  P/N 2 275 136 A DOWN  P/N 2 345 272 B UP  P/N 2 275 137 B UP  P/N 2 345 273 B DOWN  P/N 2 275 138 B DOWN  P/N 2 345 289 SERVO  P/N 2 275 177 SERVO
Suggesting there is three sorts of heads A & B & SERVO and the A & B heads come in two flavours UP & DOWN.
Anyone who can shed light on these distinctions is encouraged to say.
Obviously the servo head was read only.
This a 3330-II disk pack in its storage container.
The label reads
IBM CE SCRATCH PACK
MOD ST370. HDM.
On the top was a label:
SERVO COMPUTER SERVICES LTD.
Date: 25 NOV 1982
Tel: DRONFIELD 0246 410375
ST370 190D 11.
This label resulted from the practice of cleaning the disk packs.
Every few months a service person from SERVO COMPUTER SERVICES would arrive
and set up a cleaning drive.
On this drive a pack would be mounted and the cover removed.
The service person would wrap a lint free cloth around a plastic spatular,
soak it in a solvent and gently wipe each disk surface. The cloth entered white and exited tinted red.
The heads on the disk drives were similarly cleaned by the IBM CEs.
This is the top of the disk pack with the cover removed. The label reads: IBM CE PACK MOD II
A view of the bottom of the disk pack.
An edge view with the cover off.Back to DASD.