Seagate external drive not recognized

Seagate Back Up Plus external drive is no longer recognized by my Macbook Pro. There were no warnings or prompts just one day was no longer recognized by Finder, Disk Utility and Disc Warrior can't see it either. I can hear the whirring sound of it starting up when plugged in to my computer. Any ideas how to get it back?

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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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.
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Thanks kaz-k,
/dev/disk0
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Please provide your complete model number of your system.
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"Knowledge should be unrestricted and the most important commodity we can offer to help one another."

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Shteeg wrote:
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MeganEllen wrote:
What can it be? what can I do??
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test with another computer even a windows computer should be able to detect it even if not mount it
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JS,
I had some trouble following macmenno's instructions, but have had almost complete success. If you DO have your original itunes library file, this should work for you too.
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tayzerbrain wrote:
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Seagate external drive not recognized

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