After two weeks, the hard drive is no longer recognized on the PC, the partition seemed to be missing. In another housing, the partition was gone.
Since I have the data yet secured to another HDD, the external hard drive formatted and have the data played back.
But the next day all the data were gone again. An error of the hard drive itself can exclude me, because this works fine since again in a Sharkoon housing, and the error of CnMemory housing is reproducible with other hard drives.
The second case is working so far but without error.
For support of CnMemory I can übrigends say that he does not exist, two emails were ignored and brushed off a call.
That's why I can not really recommend the housing. While it is very cheap and performant, but leave the service and reliability to be desired.
Addendum:
Now the error occurred and the second housing with the second hard drive. So I have every WD30EZRX owners explicitly warn against the use of this housing!