rubl
Crazy Mango Extraordinaire
The wondering type
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Post by rubl on Feb 28, 2016 18:18:57 GMT 7
This is how your hard drive looks like inside the cover. Now the theone in the clip is a 'wee bit' older, but your 2.5" 500GB drive isn't that much different. PS this is one of those "don't try this at home" things, unless you have made a proper backup before  |
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rubl
Crazy Mango Extraordinaire
The wondering type
Posts: 23,997
Likes: 9,333
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Post by rubl on Feb 28, 2016 18:21:16 GMT 7
PS this is a picture of a 2MB drive unit, the IBM 1311 Disk Storage Drive which provided storage for 2 million characters. www-03.ibm.com/ibm/history/exhibits/storage/images/PH1311A.jpgThe 1311 used the IBM Disk Pack (later designated the IBM 1316 ), an interchangeable package containing six 14-inch-diameter disks in a four-inch stack, weighing 10 pounds (seen above in the man's left hand). Each disk surface contained 20 pie-shaped regions. Sectors were segments of track lying within a region, and were the smallest addressable unit, with a capacity of 100 characters. Average access time to any sector was 250 milliseconds, which could be reduced to 150 milliseconds with an optional direct-seek feature. The disks were rotated at 1500 rpm, tracks (50 to the inch) were recorded at up to 1025 bits per inch, and the usual head-to-surface spacing was 125 microinches. The ten recording surfaces provided in normal usage a storage capacity of 2 million characters, the equivalent of approximately 25,000 punched cards or a fifth of a reel of magnetic tape. |
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