## Physical Device Driver Reference

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### DSK_SETDEVICEPARAMS (43h) - Device Attributes

Device Attributes A bit field that returns flag information about the specified drive:

Bit 0 Removable Media flag. This bit is set to 1 if the media cannot be removed. It is set to 0 if the media is removable.
Bit 1 Changeline flag. This bit is set to 1 if the device support determines that the media was removed since the last I/O operation. To query whether the media has changed, call the device driver Strategy Command 1h.

If this bit is set to 0, then the physical device driver can return the value 0, Unsure if media has changed, from the Media Check function.