Seagate external drive not recognized since firmware update

I've looked through the posts here and haven't found this issue addressed specifically, so here goes. Any help will be appreciated.
I ran the firmware update on my MacBook Pro the other day, and everything has been normal since, except when I went to switch on my Seagate external HD - which I use as a backup drive - this morning. The mac doesn't see it at all.
Brought the drive into the office this morning and the iMac here, which hasn't been updated in at least 6 months, sees the Seagate right away.
I haven't upgraded to Leopard, though I have it, becuase I'm in the middle of a project and don't want any trouble with ProTools. In fact, I hadn't been making any updates at all, but in a moment of weakness ran the firmware update!
Thanks in advance.

Thanks kaz-k,
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            749.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            DiskWarriorDVD         *1.4 GB     disk1
192-168-1-2:~ Jessie$

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Thanks kaz-k,
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