Disk Manager was a popular 1980s and 1990s software and documentation package for MS-DOS

MS-DOS

MS-DOS is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid 1990s, until it was gradually superseded by operating...

 and PC DOS computers, useful for self-installing PC hard disks. It was written by Ontrack.

Installation covered different aspects:

• explaining hardware concepts
• documenting switches of many of the existing disks
• putting into place custom software drivers which circumvented BIOS or even DOS limitations, notably those related to maximum disk or partition size
• providing testing and informational utilities

Drivers could be either DOS-type, or replacement Master Boot Record

Master boot record

A master boot record is a type of boot sector popularized by the IBM Personal Computer. It consists of a sequence of 512 bytes located at the first sector of a data storage device such as a hard disk...

code.

Diskettes with Disk Manager were provided by some disk manufacturers (eg. IBM), in custom OEM versions, supporting all of their models.

In the recent years the company has switched to the business of providing disk recovery services and changed its name to Ontrack Data Recovery.