HP 7935

The HP 7935 is a business computer hard disc drive system manufactured by Hewlett Packard.

It was produced by the Disc Memory Division[1] in Boise, Idaho USA beginning in 1982[2] at a cost of about $27,000.

[3] Within the company the drive was known as the "BFD", ostensibly an acronym for "big fixed disc" but the development engineers had used that acronym for "big fucking disc"[citation needed], a term relative to the smaller 7920 series drives introduced earlier by the company.

The 7935 had four bottom mounted casters for moving and four lock-down feet for stability in the computer room.

[7] The HP 7935/33 achieved a track density of 625 tracks per inch (considered high at the time), achieving capacity using 7 platters, 13 data surfaces and 14 heads (one head and surface were used for servo data).