History of HDD
The hard disk was developed in 1953 by IBM developers who were looking for a solution to offer low-cost random access to large amounts of data. The first disk drives, which had a capacity of 3.75 MB and were the size of refrigerators, started to be shipped in 1956. Another early supplier of hard disk drive technology was Memorex, followed by Seagate Technology and Western Digital.
The size of hard disk drives has been getting smaller as technology has advanced. The 2.5-inch and 3.5-inch form factors were introduced and standardized in personal computers by the middle of the 1980s.
The storage capacity of latest hard disk drives is in the terabyte range, compared to the initial hard disk drives’ capacity of megabytes. HGST, formerly known as Hitachi Global Storage Technologies, is a Western Digital brand released the first 1 TB hard drives in 2007. In 2015, HGST introduced the first 10 TB hard drive. And in 2021, Western Digital introduced two 20 TB HDDs.
Hard Disk Drive (HDD) Secondary memory
Primary memory has limited storage capacity and it is volatile. Secondary memory overcomes this limitation by providing permanent storage of data in bulk quantity. Secondary memory is also termed external memory and refers to the various storage media on which a computer can store data and programs. The Secondary storage media can be fixed or removable. Fixed Storage media is an internal storage medium like a hard disk that is fixed inside the computer.