Hello.
I see error 21 and the message "the device is not ready" when using dism to create and write an image to an external USB drive from the WinPe shell.
The external USB drive is a SSD connected to a USB 3.0 to SATA adapter.
There are two partitions on the SSD, one for booting WinPe and the other for file storage.
Both partitions are accessible from within the WinPe shell.
I am able to manually create files on the file storage partition.
I have tried two different USB 3.0 to SATA adapters both fail the same way.
There are no problems if using an external SSD with a USB 3.0 micro Type b cable/connector (so, no adapter)
There are no problems if using two thumb drives (one with WinPe boot image, the other to store .wim)
I tried including the uaspstor driver in my WinPe image but still see error 21.
I'm out of ideas. Please help.
Thank you,
Lawrence F.