IBM 2305

The IBM 2305 Direct Access Storage Facility was a fixed-head disk drive originally announced in 1970 to connect to the 360/85 and 360/195 using the IBM 2880 Block Multiplexor Channel. The 2305-1 ran at 3.0 MB/second when attached using the 2-byte channel interface, and the larger 2305-2 ran at 1.5 MB/second.
The 2305/2835 Storage Facility became popular with the System/370, and used as the paging device of choice, for systems 155-2, 158, 165-2 and 168. This was particularly true at IBM internal data centers where obsolete equipment was often all that was available. When floor space was not at a premium, the fixed head storage devices gave paging performance comparable to the alternative of using only the small amount of disk space located under one seek position of a standard disk drive and leaving the rest of the volume empty, which was a common practice in high transaction environments such as airline reservation systems, for paging and high volatility data storage.

Hasitha Helappriya

Some say he’s half man half fish, others say he’s more of a seventy/thirty split. Either way he’s a fishy bastard.

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