How can I crack a veracrypt encrypted partition?

[hashsmash]

Meanwhile i figured out to extract the hash via

Code:

dd if=\\?\Device\HarddiskVolume12 of=hash.txt bs=512 count=1

Besides some unreadable text, there was the information that

error reading data medium
BOOTMGR compressed
restart with Strg+Alt+Del

How can I get access to this volume?