The DCSS device is in shared access mode and cannot be written to. Depending
on the type of the DCSSs that the device maps to, you might be able to
change the access mode to exclusive-writable.
User response
If the DCSSs of the device are of type SC, do not attempt to write to the
device. If the DCSSs of the device are of type ER or SR, change the access
mode to exclusive-writable before writing to the device.