Artifact Details

Title

3550 Direct Access Storage Device (DASD)

Catalog Number

X865.88

Type

Physical object

Date

1975

Manufacturer

International Business Machines Corporation (IBM)

Place Manufactured

U.S.

Identifying Numbers

Model number 3550

Description

Known internally at IBM as the "Madrid" project, the 3350 disk drive improved upon IBM's novel Winchester technology by increasing the number of platters as well as the recording density from earlier drives. This was achieved partly by making the drive a fixed system-- rather than one employing a removable disk pack--thereby simplifying design and allowing for tighter tolerances to be maintained. For a synoptic view of historical disk drive development at IBM, technical specifications on these drives and the 3350's place therein, see Pugh, E., "IBM's 360 and Early 370 Systems," p. 512. Alternate Donor: Ronald Smith

Category

Memory: disk

Lot Number

X865.88