Introduced in 1957, the IBM-made random right of entry method of accounting and control (RAMAC) was the first disk drive. It consisted of 50 magnetic disks of 24-inch in diameter and revolving at 1200 RPM. Two air-bearing supported magnetic heads accessed all 50 disks. The storage capacity of this system was 5 MB with the information rate of 12.5 kB/s, and the system was rented to the end user for $130 a month. The system used Aluminum sliders, Mu-metal heads, had 20 track per inch and 0.002 Mb/in2, and the slider / disk spacing was about 20 micrometers. About 40 years later, the IBM Travel star 6GT drive has 3 thin-film 2.5 inch disks and 6 earthenware sliders with the heads working on magneto-resistive principles and flying over the disk surface at only about a few dozens nm. The track density is 16,000 TPI (track per inch) and the areal thickness is 4.1 GB/in2. The drive's 33.3 MB/sec data transfer rate reimbursement from the Ultra DMA border. In fact, this drive is not the latest and the best, it just was arbitrarily chosen to make one tip - there has been a huge development in the field of hard disk drive (HDD) skill in the 40 years, and the rate of this progress is just rising year after year.
Manufacturer SAMSUNG
Specifications
Capacity 120 GB
Interface PATA 100
Access Time 12 ms -
Buffer 8MB
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