In a message dated 8/3/2005 6:08:05 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >There was no IBM 2305 drum; the 2305 was a disk drive.
I cannot find any IBM technical publication describing the 2305, but it was called a drum by everyone I knew and by many people writing technical articles. Google for "2305 drum" and look at the voluminous hits; e.g. this one from IBM's 1973 Technical Journal: _http://www.research.ibm.com/journal/rd/175/ibmrd1705E.pdf_ (http://www.research.ibm.com/journal/rd/175/ibmrd1705E.pdf) (scan article for "2305"); this one: _http://www.icann.org/tlds/name1/links/APPENDIX.D.2.1.3-5.pdf_ (http://www.icann.org/tlds/name1/links/APPENDIX.D.2.1.3-5.pdf) (scan for "2305" and you see these sentences: "The concept of PAVs is similar to that of "multiple exposures" as implemented for the IBM 2305 drum device, often used for paging and for job queue datasets in the days before cached control units. The cached 3880-21 also supported multiple exposures for paging." There are also several technical articles that show up via Google in which it is called a "2305 disk." What did the SYSGEN/IOGEN book call it? Where do we go for the most official nomenclature? IBM officially called it a "fixed head storage" device (usually called drums) as opposed to a moving head storage device (usually called disks) in this one: _http://www-03.ibm.com/ibm/history/exhibits/storage/storage_2305.html_ (http://www-03.ibm.com/ibm/history/exhibits/storage/storage_2305.html) Here is some of the text from that link: "A 2305 facility consisted of an IBM 2835 Storage Control and one or two 2305 fixed head storage modules. Each disk drive contained six disks with 12 recording surfaces. ... Read/write heads were fixed in position over each track." Having read/write heads fixed over each track makes it a drum. It looked like a drum, walked like a drum, and quacked like a drum. Bill Fairchild ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
