Hi,

I've had these two WD drives (4 TB & 2 TB) hooked up (daisy-chained)  
to my iMac 24" for a while now.

First yesterday I couldn't access some second level directories now I  
get this warning from
'About This Mac/firewire' - "FireWire Bus:  Warning:    Unable to list  
FireWire devices."
even when they are plugged in individually.

That's on the iMac, on the MacMini both drives work fine.

I get the same result when I start the iMac in Safe Mode.

The iMac's OS is 10.5.8 - the MacMini's OS 10.6.8.

Both the 2 TB and 4 TB have the File System: Journaled HFS+.

Both are called My Book though the 4 TB has 3 partitions. (each  
drive's info is listed below)

I've only hooked them up to the MacMini individually incase I loose  
access to them altogether.

I had a similar problem with them about a month ago but a PRAM reset  
brought things right again,
it doesn't help anymore.

I took computer (not the drives) into NextByte where they ran some  
tests on it and
hooked up a laptop to it via FW800 with no problems and declared the  
iMac to have no
issues.

Is there a way of getting my iMac to recognize these drives again?

Thanks
Brian Scott

- Here are each drive's info..

The 2 TB...
FireWire Bus:

   Maximum Speed:       Up to 800 Mb/sec

My Book:

   Manufacturer:        WD
   Model:       0x1105
   GUID:        0x90A99500A395B0
   Maximum Speed:       Up to 800 Mb/sec
   Connection Speed:    Up to 800 Mb/sec
   Sub-units:
My Book Unit:
   Unit Software Version:       0x10483
   Unit Spec ID:        0x609E
   Firmware Revision:   0x1015
   Product Revision Level:      1015
   Sub-units:
My Book SBP-LUN:
   Capacity:    2 TB (2,000,392,994,816 bytes)
   Removable Media:     Yes
   BSD Name:    disk2
   Partition Map Type:  APM (Apple Partition Map)
   S.M.A.R.T. status:   Not Supported
   Volumes:
   Capacity:    32 KB (32,256 bytes)
   Writable:    No
   BSD Name:    disk2s1
My Book:
   Capacity:    2 TB (2,000,258,736,128 bytes)
   Available:   209 GB (209,002,385,408 bytes)
   Writable:    Yes
   File System: Journaled HFS+
   BSD Name:    disk2s3
   Mount Point: /Volumes/My Book
My Book Device Unit:
   Unit Software Version:       0x10483
   Unit Spec ID:        0x609E
   Firmware Revision:   0x1015
   Product Revision Level:      1015
   Sub-units:
My Book Device SBP-LUN:

The 4 TB...
FireWire Bus:

   Maximum Speed:       Up to 800 Mb/sec

My Book:

   Manufacturer:        WD
   Model:       0x1105
   GUID:        0x90A99500B02281
   Maximum Speed:       Up to 800 Mb/sec
   Connection Speed:    Up to 800 Mb/sec
   Sub-units:
My Book Unit:
   Unit Software Version:       0x10483
   Unit Spec ID:        0x609E
   Firmware Revision:   0x1017
   Product Revision Level:      1017
   Sub-units:
My Book SBP-LUN:
   Capacity:    4 TB (4,000,781,090,816 bytes)
   Removable Media:     Yes
   BSD Name:    disk2
   Partition Map Type:  GPT (GUID Partition Table)
   S.M.A.R.T. status:   Not Supported
   Volumes:
   Capacity:    209.7 MB (209,715,200 bytes)
   Writable:    Yes
   BSD Name:    disk2s1
2TB:
   Capacity:    2.25 TB (2,248,501,121,024 bytes)
   Available:   1.73 TB (1,734,896,709,632 bytes)
   Writable:    Yes
   File System: Journaled HFS+
   BSD Name:    disk2s2
   Mount Point: /Volumes/2TB
SDBU924:
   Capacity:    992.44 GB (992,441,819,136 bytes)
   Available:   992.19 GB (992,189,603,840 bytes)
   Writable:    Yes
   File System: Journaled HFS+
   BSD Name:    disk2s3
   Mount Point: /Volumes/SDBU924
TM707:
   Capacity:    759.23 GB (759,225,741,312 bytes)
   Available:   481.74 GB (481,735,430,144 bytes)
   Writable:    Yes
   File System: Journaled HFS+
   BSD Name:    disk2s4
   Mount Point: /Volumes/TM707
My Book Device Unit:
   Unit Software Version:       0x10483
   Unit Spec ID:        0x609E
   Firmware Revision:   0x1017
   Product Revision Level:      1017
   Sub-units:
My Book Device SBP-LUN:



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