IOCTL's to add/remove bad clusters on NTFS volume?

NTDEV
1

I have a need to store some data outside the file system on an NTFS volume.
I seem to remember 2 IOCTL’s (or perhaps FSCTL’s) that allow you to manually
add and remove clusters to NTFS’s bad cluster file, which seems like a
fairly safe way to allocate some disk space where NTFS (and defragmenter’s)
will leave it alone.

I’m now wondering if I just imaged those IOCTL’s, because I can’t seem to
find them anywhere. Can anybody point me to them?

Thanks.

  • Jan
2

This is a very tenuous solution. I did something like this under DOS about
20 years ago and a good disk checker will trash your data.

If you only need to store the data during a single session, you can use a
filter driver and a couple of bitmaps to store your data “out-of-band”.

I worked on a project recently that did this exact same thing (storing data
outside of the file systems allocations.) It was a snapshot technology that
saved the copy-on-write data “out-of-band”.

Let me know if you need more details.

Jamey

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Jan Bottorff
Sent: Tuesday, November 23, 2004 11:37 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] IOCTL’s to add/remove bad clusters on NTFS volume?

I have a need to store some data outside the file system on an NTFS volume.
I seem to remember 2 IOCTL’s (or perhaps FSCTL’s) that allow you to manually

add and remove clusters to NTFS’s bad cluster file, which seems like a
fairly safe way to allocate some disk space where NTFS (and defragmenter’s)
will leave it alone.

I’m now wondering if I just imaged those IOCTL’s, because I can’t seem to
find them anywhere. Can anybody point me to them?

Thanks.

  • Jan

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

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