Ramesh wrote In Logical Disk Manager has two type of storage mode for HDD. Basic Disks Dyanamic Disks The basic partitions are limited to one disk and size is fixed. Dynamic volumes permit to adjust size and to add more free space either from the same disk or another physical disk. Dyanamic Disks are used to create spanned disk to implement RAID levels.

It may be little offtopic but why can't we install vista if a disk becomes dynamic as vista was not able to detect HDD after accidentially it became dynanic

Vista can be installed in Dynamic disk....