External hard drive no longer shows up on Desktop

Hi everyone,
I did what a good person should do with a tech issue and did a long search through forums before I resigned to bothering you all with it.
I've had a 500GB Seagate FreeAgent GoFlex Media external hard drive for 6 months which up until this week, was showing up as an icon on my Desktop. I had named it Eid HD.
I suddenly am unable to access this drive on my MacBook Pro. The Desktop icon has disappeared but the drive still lights up as per normal. I'm using OS X v10.6.8
I tried changing USB cables.
The drive appears in Disk Utility as follows (the yellow icons):
I read somewhere that I needed to mount it. The first yellow icon doesn't have the mount option. The second one (Eid HD) has the option but when I mount it, I get the following message:
Mount Failed.
The disk “Eid HD” could not be mounted.
Try running First Aid on the disk and then retry mounting.
I verified and repaired (First Aid) the disk. Results:
Tried to mount - same error message as above. Mount failed.
I downloaded Disk Warrior and although the drive appears in there, I can't do anything with it. The Graph and Rebuild buttons are both greyed out.
Does anyone have any ideas about how to fix this?
The files are still on the drive as I used it on a Windows machine to test it.
I don't want to format it.
Please help if you can, thank you in advance.
Sam

I verified and repaired (First Aid) the disk. Results:
That quote is from your first post. But I have some questions about that (maybe just to satisfy my own curiosity).
1. When you ran Disk Utility First Aid did you do it on the disk itself (the one that is enabled with the Seagate title)?
2. That First Aid window title line says "First Aid: EID HD" yet my DU window title only shows the name exactly as it appears in the left panel, no "First Aid:" prefix. So is that a change in 10.6.8 (I use 10.6.5)?
3. You display shows lines like "Verifying folders", "Folders verification completed", and "Verifying $...". Again I have never seen DU display that kind of info. Another 10.6.8 change?
As I said, I am only curious. It may not mean anything. But I thought I would point out these details just in case.
If these aren't 10.6.8 changes (I find it hard to believe apple would change DU after all these years just from 10.6.5 to 10.6.8) then just what DU First Aid were you running?

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I have a MacBook Pro, 10.10.2 Yosemite. My external hard drive no longer appears on my screen or in Time Machine. I have gone into Disc Utility to repair disc, and get the message: Error: Partition map check failed because no slices were found. I was trying to follow Melophage's instructions by going into "Terminal" and entering "diskutil list; diskutil cs list; mount" and "diskutil info disk2." Then I entered the command "sudo got show disk1."   I am sure I have made the problem worse. Can you give me some help? Thank you. blelambert
Last login: Wed Mar 11 19:23:03 on ttys000
~ belambert$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         250.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
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   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *249.8 GB   disk1
                                 Logical Volume on disk0s2
                                 7A998EAE-68FB-4BAC-BF40-7A31D2806B2C
                                 Unlocked Encrypted
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk2
   1:         Microsoft Reserved                         134.2 MB   disk2s1
~ belambert$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 883A56F4-5559-4872-A8DA-960F99655B63
    =========================================================
    Name:         Macintosh HD
Status:       Online
    Size:         250140434432 B (250.1 GB)
    Free Space:   8921088 B (8.9 MB)
    |
    +-< Physical Volume 7EDAFA20-FF9A-45FB-BA44-6526BB46C381
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     250140434432 B (250.1 GB)
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    +-> Logical Volume Family B47B0B40-CBF2-4D02-BFEF-182061AC6F8E
        Encryption Status:       Unlocked
        Encryption Type:         AES-XTS
        Conversion Status:       Complete
        Conversion Direction:    -none-
        Has Encrypted Extents:   Yes
        Fully Secure:            Yes
        Passphrase Required:     Yes
        |
        +-> Logical Volume 7A998EAE-68FB-4BAC-BF40-7A31D2806B2C
            Disk:                  disk1
            Status:                Online
            Size (Total):          249779191808 B (249.8 GB)
            Conversion Progress:   -none-
            Revertible:            Yes (unlock and decryption required)
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
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/dev/disk1 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
localhost:/vB3z604U-dvSpES6320fHq on /Volumes/MobileBackups (mtmfs, nosuid, read-only, nobrowse)
~ belambert$ diskutil info disk2
   Device Identifier:        disk2
   Device Node:              /dev/disk2
   Part of Whole:            disk2
   Device / Media Name:      WD My Book 111A Media
File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               2.0 TB (2000365289472 Bytes) (exactly 3906963456 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        512 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               2.0 TB (2000365289472 Bytes) (exactly 3906963456 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        512 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
belambert ttys000                   Wed Mar 11 17:34 - 17:39 (00:05)
belambert ttys000                   Wed Mar 11 17:33 - 17:34 (00:00)
wtmp begins Sun Mar 8 14:40
~ belambert$ ~ belambert$ diskutil list
-bash: :~: command not found
~ belambert$ /dev/disk0
-bash: /dev/disk0: Permission denied
:~ belambert$    #:                       TYPE NAME                    SIZE       IDENTIFIER
~ belambert$    0:      GUID_partition_scheme                        *251.0 GB   disk0
-bash: 0:: command not found
:~ belambert$    1:                        EFI EFI                     209.7 MB   disk0s1
-bash: 1:: command not found
~ belambert$    2:          Apple_CoreStorage                         250.1 GB   disk0s2
-bash: 2:: command not found
~ belambert$    3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
-bash: /dev/disk1: Permission denied
~ belambert$    #:                       TYPE NAME                    SIZE       IDENTIFIER
~ belambert$    0:                  Apple_HFS Macintosh HD           *249.8 GB   disk1
-bash: 0:: command not found
~ belambert$                                  Logical Volume on disk0s2
-bash: Logical: command not found
~ belambert$                                  7A998EAE-68FB-4BAC-BF40-7A31D2806B2C
-bash: 7A998EAE-68FB-4BAC-BF40-7A31D2806B2C: command not found
~ belambert$                                  Unlocked Encrypted
-bash: Unlocked: command not found
:~ belambert$ /dev/disk2
-bash: /dev/disk2: Permission denied
~ belambert$    #:                       TYPE NAME                    SIZE       IDENTIFIER
:~ belambert$    0:      GUID_partition_scheme                        *2.0 TB     disk2
-bash: 0:: command not found
~ belambert$    1:         Microsoft Reserved                         134.2 MB   disk2s1
-bash: 1:: command not found
~ belambert$ ~ belambert$ diskutil cs list
-bash: ~: command not found
~ belambert$ CoreStorage logical volume groups (1 found)
-bash: syntax error near unexpected token `('
~ belambert$ |
-bash: syntax error near unexpected token `|'
~ belambert$ +-- Logical Volume Group 883A56F4-5559-4872-A8DA-960F99655B63
-bash: +--: command not found
~ belambert$     =========================================================
-bash: =========================================================: command not found
~ belambert$     Name:         Macintosh HD
-bash: Name:: command not found
~ belambert$
-bash: 3:: command not found
~ belambert$ /dev/disk1
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported
:~ belambert$ Last login: Wed Mar 11 19:23:03 on ttys000
~ belambert$ diskutil list
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported
~ belambert$ Last login: Wed Mar 11 19:23:03 on ttys000
~ belambert$ diskutil list
   Volume Name:              Not applicable (no file system)
   Mounted:                  Not applicable (no file system)

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