Sorry for the misunderstanding, i've just posted one exemplary disk from this group, the whole disklist looks like this :
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Name MediaName Diskgroup DiskStyle Size(MB) FreeSpace(MB) Status
Harddisk0 BasicGroup MBR 938563 938563 Uninitialized
Harddisk1 BasicGroup MBR 938563 938563 Uninitialized
Harddisk10 BasicGroup MBR 938563 938563 Uninitialized
Harddisk11 BasicGroup MBR 938563 938563 Uninitialized
Harddisk12 BasicGroup MBR 938563 938563 Uninitialized
Harddisk13 BasicGroup MBR 938563 938563 Uninitialized
Harddisk14 BasicGroup MBR 938563 938563 Uninitialized
Harddisk15 BasicGroup MBR 938563 938563 Uninitialized
Harddisk16 BasicGroup MBR 451898 451898 Uninitialized
Harddisk17 BasicGroup MBR 486664 486664 Uninitialized
Harddisk18 BasicGroup MBR 451898 451898 Uninitialized
Harddisk19 BasicGroup MBR 486664 486664 Uninitialized
Harddisk2 BasicGroup MBR 938563 938563 Uninitialized
Harddisk20 BasicGroup MBR 938563 938563 Uninitialized
Harddisk21 BasicGroup MBR 938563 938563 Uninitialized
Harddisk22 BasicGroup MBR 938563 938563 Uninitialized
Harddisk23 BasicGroup MBR 938563 938563 Uninitialized
Harddisk24 BasicGroup MBR 938563 938563 Uninitialized
Harddisk25 BasicGroup MBR 938563 938563 Uninitialized
Harddisk26 BasicGroup MBR 451898 451898 Uninitialized
Harddisk27 BasicGroup MBR 486664 486664 Uninitialized
Harddisk28 BasicGroup MBR 451898 451898 Uninitialized
Harddisk29 BasicGroup MBR 486664 486664 Uninitialized
Harddisk3 BasicGroup MBR 938563 938563 Uninitialized
Harddisk30 BasicGroup MBR 938563 938563 Uninitialized
Harddisk31 BasicGroup MBR 938563 938563 Uninitialized
Harddisk32 BasicGroup MBR 938563 938563 Uninitialized
Harddisk33 BasicGroup MBR 938563 938563 Uninitialized
Harddisk34 BasicGroup MBR 938563 938563 Uninitialized
Harddisk35 BasicGroup MBR 938563 938563 Uninitialized
Harddisk36 BasicGroup MBR 451898 451898 Uninitialized
Harddisk37 BasicGroup MBR 486664 486664 Uninitialized
Harddisk38 BasicGroup MBR 451898 451898 Uninitialized
Harddisk39 BasicGroup MBR 486664 486664 Uninitialized
Harddisk4 BasicGroup MBR 938563 938563 Uninitialized
Harddisk40 BasicGroup MBR 34727 4 Uninitialized
Harddisk41 Disk1 DG_Hostname1 MBR 104281 0 Imported
Harddisk42 BasicGroup RAW 0 104281 Offline
Harddisk43 Disk2 DG_Hostname2 MBR 104281 0 Imported
Harddisk44 BasicGroup RAW 0 104281 Offline
Harddisk5 BasicGroup MBR 938563 938563 Uninitialized
Harddisk6 BasicGroup MBR 451898 451898 Uninitialized
Harddisk7 BasicGroup MBR 486664 486664 Uninitialized
Harddisk8 BasicGroup MBR 451898 451898 Uninitialized
Harddisk9 BasicGroup MBR 486664 486664 Uninitialized
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And i don't think i can destroy the BasicGroup because the local Volumes (C: & D:) are in this Group.