I get this behaviour as well:
disk disk-1 disk-10 disk-11 disk-2 disk-3 disk-4 disk-5 disk-6 disk-7 disk-8 disk-9 MyBook-ReiserFS MyBook-ReiserFS_ MyBook-ReiserFS__ VX2PFPP_DE VX2PFPP_DE_ VX2PFPP_DE__ VX2PFPP_DE___ VX2PFPP_DE____
I get this behaviour as well:
disk
disk-1
disk-10
disk-11
disk-2
disk-3
disk-4
disk-5
disk-6
disk-7
disk-8
disk-9
MyBook-ReiserFS
MyBook-ReiserFS_
MyBook-ReiserFS__
VX2PFPP_DE
VX2PFPP_DE_
VX2PFPP_DE__
VX2PFPP_DE___
VX2PFPP_DE____