problem creating fusion drive

Errz

macrumors member
Original poster
Mar 9, 2008
51
0
when i try to key in disktuil cs create Fusion /dev/disk0 /dev/disk1
i get this error
Started CoreStorage operation
Unmounting disk0
Error: -69888: Couldn't unmount disk

below is the info of diskutil list. SSD not appearing in Disk Utility . i can only see the 1TB drive.

/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *256.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_CoreStorage 255.7 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI 209.7 MB disk1s1
2: Apple_CoreStorage 999.9 GB disk1s2
3: Apple_Boot Boot OS X 134.2 MB disk1s3
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD *1.2 TB disk2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk3
1: EFI 209.7 MB disk3s1
2: Apple_HFS Clone 499.1 GB disk3s2
3: Apple_Boot Recovery HD 784.2 MB disk3s3

anyone know what's wrong?
 

philipma1957

macrumors 603
Apr 13, 2010
6,270
191
Howell, New Jersey
THE 256GB DISK IS THERE


as is the 999gb disk.



why are you keying in anything at all. are you trying to do this via console / terminal commands


or with disk utility . quite frankly the terminal method can fail with just 1 miss stroke of the key board
 

gtstricky

macrumors regular
Apr 19, 2012
121
5
I had an issue doing it when booted from one of the drives. I ended up creating a bootable flash drive with disk utility on it and it went smooth as butter.