The ”Micro Drive HD” generally refers to a small form factor hard disk drive (HDD) that is designed for use in portable electronic devices.
The Micro Drive came out in the early 2000's.
These drives are known for their compact size, which is often comparable to that of a large coin. One example of a Micro Drive HD is the Microdrive, which was introduced by IBM and tripled the capacity of previous models.
In addition to their small size, Micro Drive HDDs are also known for their ability to fit into the mountings of small computers with built-in floppy disk drives (FDDs). This makes them a popular choice for upgrading the storage capacity of these devices.
Some Micro Drive HDDs, such as the HD-O-Matic Micro 3.5” drive, are designed to fit under a standard 3.5” hard drive and mount in a 3.5” bay. This allows them to be used as a replacement for a larger hard drive in certain applications.
It is worth noting that Micro Drive HDDs may have limitations in terms of reliability and repairability. For example, the 4GB HD, which uses Micro-Drive technology, is being marketed as a highly reliable drive, but it is not intended to be repaired by the user.
In summary, Micro Drive HDDs are small form factor hard drives that are designed for use in portable devices and small computers. They are known for their compact size and ability to fit into the mountings of floppy disk drives. Some Micro Drive HDDs may have limitations in terms of reliability and repairability.