External Hard Drive is not recognised

Hi Guys,
I have 1TB WDD exertanal drive. I have been using it for almost 6 months. It was working fine. Now all of a sudden I dont see it working. When I connect it to my MacBook Pro it doesnt appear anywhere.. I cant see it in the Disk Utility as well. However when I checked the System Profile I see that hard disk appears in the USB list. No idea how to make it work.
Any suggestion would be appreciated. Has anyone faced this problem earlier? If yes, please write your comments. It will be a greta help
Thank you all
Cheers!!
Vinay

WHAT MAKE is the drive case?
WD drives are fine, WD MyBook and Passport, not so much.
Some WD cases are built around the drive, it can't be removed or upgraded.
Otherwise it would work fine in OWC Mercury and all their drive cases are fine.
http://www.macsales.com/firewire
Also Sans Digital $29 USB/eSATA metal case (I have two).

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My external hard drive is not recognised on my mac book pro

my external hard drive is not recognised on my mac book pro

Hello all -
similar situation. Unplugged external hard drive and all to take the laptop on a trip. On return, I plugged everything back in and keep getting this message:
Time Machine couldn’t complete the backup to “Iomega_Ext_Drive”.
Files can’t be copied onto the backup disk because it appears to be read-only.
You may need to repair or reformat the disk using Disk Utility. If the disk can’t be repaired, you must use a different disk for backups. Open Time Machine preferences to select a different backup disk.
open time machine preferences. -
I tried this and tried "repair" but that didn't work and I still get this message. Any advice? thanks

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I am running 10.9.1 on my MBP13" mid 2010.
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This has been going on for a couple of weeks.
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Icon not on desktop
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katlandsf wrote:
I have a 750gb hard drive that Time Machine backs up on. It's been for going strong for over 2 years now. My hard drive is filling up, I only have 35gb left. Is it okay for me to delete many of the old backups dated from 2 years ago? I really only need to keep the last 6-12 months. Not sure how to handle this.
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Do other peripherals work when connected to the MBP?
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catchands wrote:
On Disk Utility it says I have options of either Repair or Verify Disk - is that what I need to do? Sorry - tech noob here.
Yes, first Verify and then Repair.
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zone-5 wrote:
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Hi,
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External Hard Drive is not recognised

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