What is HORM and how can you use it?

re: What is HORM and how can you use it?

Quentin — Fri, 03 Nov 2006 19:10:48 GMT

Do these new EWF API calls work if you only have one volume protected, or do I still have to unmount/disable/blah/blah any unprotected volumes before calling?

Quentin.

re: What is HORM and how can you use it?

Mike — Tue, 07 Nov 2006 00:26:40 GMT

Quentin,

Yes, these new API calls work if you only have one volume protected and you do not have to unmount/disable any unprotected volume before calling them.

The unmounting/disabling comes into picture when you have more than 1 volume protected by the EWF and you want to use HORM. You can read more on that here:

http://blogs.msdn.com/embedded/archive/2006/05/10/594674.aspx

re: What is HORM and how can you use it?

Scott — Thu, 21 May 2009 03:41:08 GMT

I'm not getting something that's probably obvious with HORM; but why do the HORM API functions take a handle? Is this handle always to the device (volume?) that has %SYSTEMROOT%?

re: What is HORM and how can you use it?

srkamath — Thu, 21 May 2009 06:22:22 GMT

On XPe HORM.dat is always located at the root of the system partition which is identified by %systemroot%. So yes, it is redundant to ask the user to provide the handle as input to HORM APIs.

Thanks

Srikanth Kamath [MSFT]

re: What is HORM and how can you use it?

Scott523 — Thu, 21 May 2009 16:16:20 GMT

Thanks for clearing that up Srikanth!

-- Scott

re: What is HORM and how can you use it?

srkamath — Thu, 21 May 2009 21:34:33 GMT

>the root of the system partition which is identified >by %systemroot%

Just to clarify , by system partition I meant the partition in which Windows is installed. I should've used the term "windows partition" instead.

Thanks

Srikanth

re: What is HORM and how can you use it?

sean — Mon, 27 Jul 2009 02:05:17 GMT

Do you know of any way to have HORM-like functionality on XP Home or Pro?

re: What is HORM and how can you use it?

srkamath — Mon, 27 Jul 2009 19:50:03 GMT

Theoretically yes. You need a write filter and a HORM aware boot environment. But neither EWF nor EWFNTLDR are part of XP Pro product.

Thanks

Srikanth