3TB Western Digital

@themaddoctor , I didn't see a repository or anything for the PDF you created, so I'm creating my issue here.

I'm following your guide on a 3TB JMicron.

Everything is working up to the point of

```
cat dek.hex | xxd -p -r | sudo cryptsetup -d - --hash=plain \
--key-size=256 -c aes-ecb create wd-layer2 /dev/mapper/wd-layer1

Cannot read requested amount of data.
```
I'm not sure if this has anything to do with it, but the drive has two partitions. I didn't think so as this command doesn't seem to point to anything about disk/partition size, but mentioned just in case.

Any ideas?