https://community.hpe.com/t5/disk-enclosures/disk-type-unknown/m-p/2703127#M4637 I have installed a 5302 in a Proliant ML370 with 6 disks. (2x18Gb and 4x72Gb.) <BR />The 5302 has been setup with array 'A' as RAID1 across 2 18Gb disks, array 'B' as RAID5 across 4 72GB disks <BR />Using Disk Manager in Windows 2000, arrays 'A' can be partitioned and formatted and given drive letters, but array 'B' is detected as 'Unknown', has a red warning icon and can't be partioned. Sun, 14 Apr 2002 23:00:00 GMT Ayman Altounji 2002-04-14T23:00:00Z https://community.hpe.com/t5/disk-enclosures/disk-type-unknown/m-p/2703127#M4637 I have installed a 5302 in a Proliant ML370 with 6 disks. (2x18Gb and 4x72Gb.) <BR />The 5302 has been setup with array 'A' as RAID1 across 2 18Gb disks, array 'B' as RAID5 across 4 72GB disks <BR />Using Disk Manager in Windows 2000, arrays 'A' can be partitioned and formatted and given drive letters, but array 'B' is detected as 'Unknown', has a red warning icon and can't be partioned. Sun, 14 Apr 2002 23:00:00 GMT https://community.hpe.com/t5/disk-enclosures/disk-type-unknown/m-p/2703127#M4637 Ayman Altounji 2002-04-14T23:00:00Z https://community.hpe.com/t5/disk-enclosures/disk-type-unknown/m-p/2703128#M4638 I am presuming that you are using the 18GB's for the OS, and the 72GB's for a data partition. Questions: <BR /> <BR />1. Is the server part of a cluster? <BR />2. Have you tried rescanning and writing a new signature to the disk? <BR />3. Delete and recreate the array? <BR /> <BR />Ben. Mon, 15 Apr 2002 23:00:00 GMT https://community.hpe.com/t5/disk-enclosures/disk-type-unknown/m-p/2703128#M4638 Ayman Altounji 2002-04-15T23:00:00Z