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- |======================================================================|
- | This is an abstract of this programs documentation used as a short |
- | review. To get the full concept of this program you should download |
- | all concerned files and read the programs full documentation. |
- | |
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- |==============================================================(SDN)===|
-
- HDTEST was originally written to allow comprehensive Read/Write testing
- of hard disks on IBM PCs, XTs, ATs, and "true" compatibles. The V4.10
- release relaxed many of the hardware restrictions imposed by earlier
- (V2.xx and V3.xx) versions of the program and made it useful for testing
- most MS-DOS-compatible storage devices currently in use on IBM-compatible
- computers, including removable (floppy and hard) disks and logically
- partitioned hard disks. This release (V4.45) includes BIOS-level support
- for DOS 3.3 "extended devices" and more options for the handling of
- totally unreadable sectors, and recognizes (but does not support) large
- (> 32 Mb) devices under IBM DOS 4.0 and Compaq DOS 3.31. Although many
- programs, including IBM's diagnostics, allow "surface scanning" and seek
- testing of hard disks, none that are available to the average user test
- whether the whole disk can retain the data that is or will be written to
- it. HDTEST's principal "claim to fame" is the ability thoroughly to test
- the magnetic media in a device which contains data while preserving the
- data (although data loss is unavoidable if an area which is in use has
- become unreadable).
-
- HDTEST tests the disk much more thoroughly than programs such as DFixer,
- Mace, and Norton's DT. Mace and DT, like many public domain "disk test"
- programs, simply read every cluster on the disk and report on any errors
- encountered. DFixer does better, writing 4 test patterns to every free
- cluster and checking that they can be read back correctly, but it makes
- no attempt to test clusters that are already in use - the very ones which
- contain your precious data!
-
- In addition to its testing function, HDTEST has been reported to be
- useful as an automatic disk repair utility for both hard and floppy disks
- which have developed (especially) intermittent or persistent read errors,
- preventing or impeding their normal use. Although HDTEST cannot read the
- totally unreadable, it tries much harder that DOS does and will almost
- always, in the course of its operation, allow you to recover the entire
- readable portion(s) of a file with one or more unreadable clusters in it,
- optionally either remapping all of what it reads from the disk or
- replacing bad sectors (the default) or clusters with NULLs. HDTEST is
- not an alternative to backing up your floppies and/or hard disk it may
- sometimes be able to save your neck when you forget or your backup goes
- bad too! On hard disks which have developed intermittent read errors,
- running HDTEST can sometimes totally cure the problem, presumably because
- the "flaky" sectors get rewritten and the minor misalignments and/or
- weakening of the magnetic "image" which were causing the trouble are
- corrected ... (continued)...
-
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- |=======================================================================|
- | This abstract is taken from a portion of this programs documentation |
- | and is intended to give an idea of the program. It does not reflect |
- | the entirer capabilities and features of the program and the full |
- | documentation should be consulted. (SDN) |
- |=======================================================================|