Dell CX4-120 Fault SPS and Failed/Removed status

Hello,

I have a Dell CX4-120 reporting some faults.

1\Disk array Enclosure Bus 0 Enclosure 1 is faulted

2\Disk Processor Enclosure SPE is faulted

3\Standby Power Supply SPE SPS B is faulted (I have checked the cabling is all ok with this and carried out a power down and back up)

4\Disk 10/12/7 bus 0 enclosure 1 is faulted.

It is showing 4 disks removed the disks are connected and have a amber light, i removed each disk in turn and reseated and still got the same error, i then did the same but moved to another known working slot to check if the issue follows the disk or the backplane the issue shows its the disks.

(I left disconnected and then connected and waited 1 minute at a time)

I have a spare disk so swapped one of the reported slots "removed" with the new disk and its showing online.

so suspect all the disks have failed that are reporting "removed"

i am awaiting more replacement disks but with it reporting 4 disks at fault and in RAID6 i suspect i will have lost the Raid data?

The setup is

enclosure 1 15 x 1TB SATA 7.5 Disks

enclosure 0 15 x 146GB 15k Disks with the first 4 with the RAID software on them

EMC PN for the disks that have failed are 118032589 REV:A04 Seagate 

can i use other disks if so which?

Or does it seem that the enclosure is at fault and the disks are ok and a new enclosure is required?

NaviSphere 6

any help would be appreciated 

Thanks