Data Recovery and Digital Storage Glossary
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- HDA
The mechanical portion of a rigid, fixed hard drive. It usually includes disks, heads, spindle motor, and actuator.
- Head
The mechanism that reads data from or writes data to a magnetic disk or tape. If the head becomes dirty, it will not work properly. This is one of the first things to check if your disk drive or tape drive begins to malfunction. The head is sometimes called a read/write head. Double-sided floppy disk drives have two heads, one for each side of the disk. Hard disk drives have many heads, usually two for each platter.
- HFS
Hierarchical File System. File system originally designed by Apple® for use on computers running Mac OS, also known as "Mac OS Standard."
- HFS+ (HFS Plus)
An improved version of the HFS file system, also known as "Mac OS Extended," which supports much larger files, longer filenames, and Unicode characters in file/folder names.
- High Sierra
High Sierra is a CD format that is no longer used; however, High Sierra is the basis of the ISO 9660 file format.
- Hybrid
In general, hybrid discs contain both an ISO 9660 and an HFS platform. Technically hybrid can also refer to multisession CD that is not closed (meaning that more data can be written to the disc in a separate session).
