How to Provide support for formatting a Ramdisk?

NTDEV
1

Hello everyone,

I am studying the Ramdisk sample (KMDF one ) from the WDK.
It uses FAT32 as a hard coded file system format.
What changes are needed to support formatting the ramdisk instead of using the hardcoded file system?

Thank you.
Tushar.

2

Well, the way I did it, when I was experimenting with this, was to remove all the file system code, mount it as a drive letter, and then see what IOCTLs got sent to it during the (attempted) formatting process. Google is your friend during this process, and I also wrote an IOCTL decoder to help.

Note, however, that this is an example of how *not* to do a proper RAMdisk. Even if you finally managed to get this working, the mount manager APIs are totally undocumented, so it still won’t end up looking like a real disk.

-Steve

3

> Well, the way I did it, when I was experimenting with this, was to remove all
the file

system code, mount it as a drive letter, and then see what IOCTLs got sent to
it
during the (attempted) formatting process.

Length IOCTLs are surely sent, they must be serviced.

–
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com