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This is technical documentation, created to help the programmer. It doesn't cover how to use Microsoft or Veritas software. The overview explains the general layout of a dynamic disk and the technical section shows the on-disk format of the structures.

It was originally written to complement the Linux LDM driver.

The latest version is available online and it can be downloaded in html.


To make things easier to read, some links have been hidden. The aim is to cross-link everything to everything else. If you see a key word, you should be able to click on it.

If your browser supports access keys you may be able to navigate more swiftly. Access keys 1 - 3 activate the three toolbar buttons (Try Alt-2, for the Overview)

Additionally, you can use Alt-Comma and Alt-Dot to activate Prevous and Next respectively. (Think of them as Alt-< and Alt->)

N.B. Some browsers may not use Alt, but a different key.


Neither Microsoft nor Veritas have released any documentation for the on-disk structure of the LDM (Logical Disk Manager). These documents have been pieced together by reverse-engineering the database.

I'm confident that the information is correct.
I think I know where there are gaps in my knowledge.
I may be wrong. Beware.

Contact Point

If you have any questions, suggestions or corrections, please email me.

Richard Russon,

Copyright © 2001-2015