Error 21 - The device is not ready.

Asked by William Wall on 2012-03-24

When I try to write an image to an SD card, I get "Error 21: The device is not ready" and then the application crashes when I click OK. I'm using version 0.4 because I couldn't get 0.5 to work in Windows 7 (could not see the device in the device list). Is there any way that I can get this to work?

Got this working by closing all open explorer windows.

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English Edit question
Image Writer Edit question
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Jeff B (skydiver38) said : #1

Glad you got it working. Windows Explorer being open will prevent WinImageWriter from getting a lock on the device, which is necessary for it to write the image.

Jeff B (skydiver38) said : #2

Jeff B suggests this article as an answer to your question:
FAQ #1928: “Error 21 - The device is not ready.”.

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