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I've never heard of that but it's most likely a firmware hack. Maybe Windows only reads how much space is being used, and checks the drive information for total space.
 
Its defenitely in the firmware.
Windows doesn't have direct access to any media.
Its always going to go through the controller for the media.
Hack the controller , be it the microprocessor on memory cards or the drive controller on a hard drive and you can make it report whatever you want.
 
You can cheat the OS one layer above drive firmware - just write funny partition data to the drive.

Altering the "reported capacity" field in firmware data is something many drives allow - but only down, not up, unless a buggy firmware lets you.
 
Originally posted by: Peter
Altering the "reported capacity" field in firmware data is something many drives allow - but only down, not up, unless a buggy firmware lets you.
Click to expand...

A hacked firmware?
 
You just need to change the ID the drive reports to Windows, and geometry information, and create a big partition on it. As long as you don't try to write to that area of the partition, it all works just fine
 
Geometry information and ID are (hardcoded) firmware parameters. Partition sizes are not, they're just stored data, thus easily modified.
 
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