[ros-dev] why IOCTL_DISK_GET_DRIVE_GEOMETRY_EX failed in windows 2000?

[David Grimbichler]

Try to look at this tool, "dd for Windows" here :
http://www.chrysocome.net/dd

The source code is availabe (GPL). You can find in the HTML webpage this 
information about getting the "real" size :
 >
 > Using --size
 >
 > Traditionally when using dd, if you wanted to copy an entire device, 
you did not specify a block count and dd would read until it reached the 
end of the device. If you tried to read past the end of the device, the 
data up to the end of the device would be returned and if you kept 
reading you would get an error message. Windows however does not always 
do this so --size will tell dd to figure out the size of the device and 
make sure it does not read past that point. This is important for USB 
sticks which stop working if you read past the end of them. This is not 
on by default because getting the correct size of the device is not 
always possible. Some devices also keep returning bogus data past the 
end of the device without returning a suitable error code


Hope this helps.
Sincerely,
TheProphet.



> I'm not asking a official document to tell me, hi dude,  Minimum 
> supported client of IOCTL_DISK_GET_DRIVE_GEOMETRY_EX is  Windows XP, 
> it is not supported by W2k, I asked the question here because I wanna 
> to know the fundamental "why".
> Still thank you,friend!
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