Microdrive
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The Microdrive was a miniature, one-inch hard disk drive released in 1998 by IBM. The idea was originally created in 1992 by Timothy J. Riley and Thomas R. Albrecht at the Almaden Research Center in S
1 GB IBM Microdrive
IBM and Hitachi Microdrive harddisk drives, with an American quarter for size comparison
One of the images stored by the Microdrive, taken on the STS-102 mission showing Discovery's payload bay
A disassembled 1st-generation iPod Mini, which uses a Microdrive to store data
SD card
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The SD card is a proprietary, non-volatile, flash memory card format developed by the SD Association. They come in three physical forms: the full-size SD, the smaller miniSD, and the smallest, microSD
Microdrive
…did not last long however. By the mid to late 2000s, miniature hard disk drives were being viewed as obsolete with flash media such as CompactFlash, SD, and USB flash surpassing them in speed, capacity, durability, and pricing. Main Article: HP Kittyhawk…
This microSDHC card holds 8 billion bytes. Beneath it is a section of a magnetic-core memory (used until the 1970s) that holds eight bytes using 64 cores. The card covers approximately 20 bits (2+1⁄2 bytes).
Back side of a microSD card, showing its eight electrical contacts
Back side of a UHS-II microSD card, showing the additional row of contacts
Front and back of an SD Express card