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qemu breaks vmdk larger than 600GB.
Description of problem:
The vmdk larger than 600G is corrupted after an edit by qemu-nbd. If I open the corrupted vmdk file, I find an extra **^@** byte.
```
RW 4194304 SPARSE "disk-s289.vmdk"
RW 4^@94304 SPARSE "disk-s290.vmdk"
RW 4194304 SPARSE "disk-s291.vmdk"
```
Steps to reproduce:
```
qemu-img create -f vmdk -o subformat=twoGbMaxExtentSparse disk.vmdk 1T
sudo qemu-nbd -c /dev/nbd0 disk.vmdk
sudo mkfs.btrfs /dev/nbd0
sudo qemu-nbd -d /dev/nbd0
qemu-img info disk.vmdk | head
```
Additional information:
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