hard disk

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hard disk

a data storage device in which data is stored on a magnetic disk embodied in a COMPUTER. Most hard disks can store large amounts of data, such as 20 megabytes of numbers or letters.
Collins Dictionary of Business, 3rd ed. © 2002, 2005 C Pass, B Lowes, A Pendleton, L Chadwick, D O’Reilly and M Afferson
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Now throw in a liberal sprinkling of data transfer protocols to disks and other peripherals with picturesque abbreviations such as MFM, RLL, IDE, ESDI, ST506, ST412, SCSI and SCSI 2.
The original ST506 and the ESDI were device-level interfaces that required a separate controller, both are now obsolete.
Drive interfaces have similarly evolved from the early ST506 standard with data transfer rates of less than 1 MB/sec to the enhanced small device interface (ESDI) transferring data at up to 2.5 MB/sec, integrated drive electronics (IDE) at up to 4 MB/sec and the small computer system interface (SCSI) at up to 5 MB/sec.