The device is not ready.

Details
Product: Windows Operating System
Event ID: 21
Source: Kernel
Version: 5.0
Component: System Resources
Symbolic Name: ERROR_NOT_READY
Message: The device is not ready.
   
Explanation

One of the following errors occurred:

1. The drive is empty.
2. The drive door is open.
3. The drive is in use. This can also apply to printing, as in “Error writing to LPTx the device is not ready.”

   
User Action

Do one of the following:

1. Insert a floppy disk in the drive, and then retry the command.
2. Close the drive door, and then retry the command.
3. Wait until the device is available, and then retry the command.

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