HT201250 my external hard drive no longer shows up

I use a LaCie external hardrive for my Time Machine backup on my iMac..  Since October 24th 2012, my Imac no longer recognizes my LaCie..., and in fact no external hard drive is recognized.  When I open up Time Machine it asks me to set up another Time Capsule.??  Has somethingchanged either in the operating system [OS X 10.7.5] or with iCloud that would be affecting this?  My La Cie turns on and sounds like its working, and I have checked the power supply.

Hi baltwo and Miacc,
I also have a LaCie ext HD of 1T and OS 10.7.5. Since Dec 24th 2012 I haven't been able to mount the LaCie disk. I can see it in the Disk Utility but I cannot mounted. I verified the disk and even repaired it but nothing has happened, actually there is nothing wrong with the disk, but it cannot be mounted.
I did what you suggested baltwo but I'm in the same situation as before. I cannot mount the disk and/or do Time Machine.
Any suggestions?

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       #:                       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
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                                     7A998EAE-68FB-4BAC-BF40-7A31D2806B2C
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       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *2.0 TB     disk2
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    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)
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        +-< Physical Volume 7EDAFA20-FF9A-45FB-BA44-6526BB46C381
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        |   Disk:     disk0s2
        |   Status:   Online
        |   Size:     250140434432 B (250.1 GB)
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            Encryption Status:       Unlocked
            Encryption Type:         AES-XTS
            Conversion Status:       Complete
            Conversion Direction:    -none-
            Has Encrypted Extents:   Yes
            Fully Secure:            Yes
            Passphrase Required:     Yes
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                Status:                Online
                Size (Total):          249779191808 B (249.8 GB)
                Conversion Progress:   -none-
                Revertible:            Yes (unlock and decryption required)
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                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)
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       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)
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    -bash: syntax error near unexpected token `('
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       Whole:                    Yes
       Internal:                 No
       OS 9 Drivers:             No
       Low Level Format:         Not supported
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    ~ belambert$ diskutil list
       Whole:                    Yes
       Internal:                 No
       OS 9 Drivers:             No
       Low Level Format:         Not supported
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    ~ belambert$ diskutil list
       Volume Name:              Not applicable (no file system)
       Mounted:                  Not applicable (no file system)

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