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IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators. In 1962, IBM introduced its model 1311 disk, which used six 14-inch (nominal size) platters in a removable pack and was roughly the size of a washing machine. This became a standard platter size and drive form ...
Modern hard disk drives appear to their host controller as a contiguous set of logical blocks, and the gross drive capacity is calculated by multiplying the number of blocks by the block size. This information is available from the manufacturer's product specification, and from the drive itself through use of operating system functions that ...
The capacity of hard drives has grown exponentially over time. When hard drives became available for personal computers, they offered 5-megabyte capacity. During the mid-1990s the typical hard disk drive for a PC had a capacity in the range of 500 megabyte to 1 gigabyte. [6] As of October 2024 hard disk drives up to 32 TB were available. [7]
For most disks, each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs), and 2048 bytes for CD-ROMs, DVD-ROMs and BD-ROMs. [1] Newer HDDs and SSDs use 4096 byte (4 KiB) sectors, which are known as the Advanced Format (AF). The sector is the minimum storage unit of a hard drive. [2]
However, most laptops have drive bays smaller than the 15 mm specification. 2.5-inch hard drives may range from 7 mm to 15 mm in height. There are two heights that appear to be prominent. 9.51 mm size drives are predominantly used by laptop manufacturers. 2.5-inch Velociraptor [3] and some higher capacity drives (above 1 TB), are 15 mm in ...
Name Hard drive: partition size max Native support: File systems Native support: floppy capacities 3.5" Native support: floppy capacities 5.25" Native support: floppy capacities 8.0"
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