new disks Server 2008 core come up as read-only

just added a few new disks to my 2008 core machine and after creating partitions using Diskpart, they came up as read-only

came across these entries on technet:

The suggested sequence for initializing a newly discovered disk that is offline is:

DISKPART> SELECT DISK n
DISKPART> ATTRIBUTES DISK CLEAR READONLY
DISKPART> ONLINE
DISKDISKPART> CONVERT MBR

This makes the disk read/write, online and with a MBR partition layout. The "CONVERT" command is equivalent to the "Initialize Disk" Operation in the Disk Management GUI.

If you use "DISKPART> CREATE PARTITION PRIMARY" in the place of "DISKPART> CONVERT MBR", the MBR initialization is done implicitly.