a floppy or hard disk based on the BIOS. This permits simple disk editing tasks such as saving and restoring the master boot record and other critical sectors, or even changing the active (= boot) partition in the MBR. In an NTVDM under Windows NT DEBUG cannot access the physical drive with the MBR of the operating system and is in essence useless as disk editor for the system drive. The Resource Kit and the support tools for some Windows NT versions contain DSKPROBE as a very simple disk editor supporting the use and modification of the partition table in the MBR and related tasks. Partition editor A partition editor (also called partitioning utility) is a kind of utility software designed to view, create, modify or delete disk partitions. A disk partition is a logical segment of the storage space on a storage device. By partitioning a large device into several partitions, it is possible to isolate various types of data from one another, and allow the coexistence of two or more operating systems simultaneously. Features and capabilities of partition editors vary, but generally they can create several partition on a disk, or one contiguous partition on several disks, at the discretion of the user. They can also, shrink a partition to allow more partitions created on a storage device, or delete one and expand an adjacent partition into the available space. See also Hex editor Comparison of hex editors References Utility software types