rubl
Crazy Mango Extraordinaire
The wondering type
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Post by rubl on Apr 28, 2018 12:02:27 GMT 7
This is more about the world we lived in. The mighty IBM 2321 Data Cell Drive! Probably cost an arm an two legs at the time. Still 800MB in one drive in the 60tish. www.columbia.edu/cu/computinghistory/xi06.jpgEarly-to-mid 1960s. The Data Cell was IBM's first direct-access mass storage device. The design team was managed by IBM's Alan F. Shugart, who also was involved in the design of the first modern hard disk drive with air-bearing heads and later went on to found Shugart Associates in 1973 (which pioneered the floppy diskette) and Seagate Technology in 1979. (Contrary to the rumor that the Data Cell was designed as a thesis project by an MIT engineering student whose object was a storage system using every known technology... hydraulics, pneumatics, magnetics, springs, optics, ....) The 2321 housed up to ten removable and interchangeable data cells. Each data cell contained 200 magnetic strips, which were the basic recording media. The total storage capacity was 400 million bytes or 800 million decimal digits. Up to eight 2321s could be attached to the IBM 2841 control unit, allowing an overall capacity of over 3GB. Reportedly the Data Cell required 23 liters of motor oil. Average access times for selection of a strip range from 175 to 600 milliseconds; average rotational delay one a strip is on the drum is 25 milliseconds; access time to another cylinder averages 95 milliseconds. www.columbia.edu/cu/computinghistory/datacell.html |
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me
Crazy Mango Extraordinaire
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Post by me on Apr 28, 2018 13:14:09 GMT 7
This is more about the world we lived in. The mighty IBM 2321 Data Cell Drive! Probably cost an arm an two legs at the time. Still 800MB in one drive in the 60tish. www.columbia.edu/cu/computinghistory/xi06.jpgEarly-to-mid 1960s. The Data Cell was IBM's first direct-access mass storage device. The design team was managed by IBM's Alan F. Shugart, who also was involved in the design of the first modern hard disk drive with air-bearing heads and later went on to found Shugart Associates in 1973 (which pioneered the floppy diskette) and Seagate Technology in 1979. (Contrary to the rumor that the Data Cell was designed as a thesis project by an MIT engineering student whose object was a storage system using every known technology... hydraulics, pneumatics, magnetics, springs, optics, ....) The 2321 housed up to ten removable and interchangeable data cells. Each data cell contained 200 magnetic strips, which were the basic recording media. The total storage capacity was 400 million bytes or 800 million decimal digits. Up to eight 2321s could be attached to the IBM 2841 control unit, allowing an overall capacity of over 3GB. Reportedly the Data Cell required 23 liters of motor oil. Average access times for selection of a strip range from 175 to 600 milliseconds; average rotational delay one a strip is on the drum is 25 milliseconds; access time to another cylinder averages 95 milliseconds. www.columbia.edu/cu/computinghistory/datacell.htmlThe arm and two legs showing in that photo are not bad too. What is the delay to strip for that model? |
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siampolee
Detective
Alive alive O
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Post by siampolee on Apr 28, 2018 13:41:38 GMT 7
Reckon that machine is as old as rubl!!!!
Kick start or wind up clockwork operation ?
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rubl
Crazy Mango Extraordinaire
The wondering type
Posts: 23,528
Likes: 8,892
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Post by rubl on Apr 28, 2018 16:56:08 GMT 7
Reckon that machine is as old as rubl!!!! Kick start or wind up clockwork operation ? I vaguely remember that in the 60-tish we already had electricity. Even in the 40-tish when they were having fun at Bletchley Park they had electricity. Rumour has it England had electric street lighting in 1881, imagine! |
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rubl
Crazy Mango Extraordinaire
The wondering type
Posts: 23,528
Likes: 8,892
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Post by rubl on Apr 28, 2018 17:03:07 GMT 7
This is more about the world we lived in. The mighty IBM 2321 Data Cell Drive! Probably cost an arm an two legs at the time. Still 800MB in one drive in the 60tish. www.columbia.edu/cu/computinghistory/xi06.jpgEarly-to-mid 1960s. The Data Cell was IBM's first direct-access mass storage device. The design team was managed by IBM's Alan F. Shugart, who also was involved in the design of the first modern hard disk drive with air-bearing heads and later went on to found Shugart Associates in 1973 (which pioneered the floppy diskette) and Seagate Technology in 1979. (Contrary to the rumor that the Data Cell was designed as a thesis project by an MIT engineering student whose object was a storage system using every known technology... hydraulics, pneumatics, magnetics, springs, optics, ....) The 2321 housed up to ten removable and interchangeable data cells. Each data cell contained 200 magnetic strips, which were the basic recording media. The total storage capacity was 400 million bytes or 800 million decimal digits. Up to eight 2321s could be attached to the IBM 2841 control unit, allowing an overall capacity of over 3GB. Reportedly the Data Cell required 23 liters of motor oil. Average access times for selection of a strip range from 175 to 600 milliseconds; average rotational delay one a strip is on the drum is 25 milliseconds; access time to another cylinder averages 95 milliseconds. www.columbia.edu/cu/computinghistory/datacell.htmlThe arm and two legs showing in that photo are not bad too. What is the delay to strip for that model? The main problem with the drive was to put the magnetic strip back after reading/writing. The mechanical action had a (relatively) high failure rate. Also being somewhat weighty you needed a reinforced floor, floorspace, a team of engineers and a few days to get things 'up-and-running'. As for the strip time of the human specimen in those days that might have depended on your salary level. Nowadays we are much more broad and PC minded  |
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