External usb drive 3.0 - not recognized

Daughter is off to college -
Replaced her 3 year old mac power book with a new one.
Upgraded to mountain lion as the new machine did not have it pre installed
Transfered old files to the new mac via firewire
Verified that the new installed mountian lion is working and all software apps files et al are on the new mac and all is working
After updating all apps from the app store decided it was time to attached the external drive used for time machine on the old mac to the new mac
new mac does not recoginze the external drive - does not mount
turned off the new mac attached external drive and noticed that the boot never completed just the apple screen
put the external drive back on the old mac running 10.5.8 and run a verify all checked out fine -
went back to the new mac - same thing no external drive found
went back to the old mac and got the invisible sibling error
ran a few things on the old mac within disk utility and from the support forum and the error went away
reran the and utility verified and no repair needed so I assume the drive is working
back to the new mac - again no external drive found.
the drive is a 1 TB toshiba - v6300-c
any thoughts -

Ok just to clarify,
I have the exact same problem as the original poster (aznalabukm)
I tried the SMB reset and the PRAM reset, but no luck on my late 2011 2.5 i7 Macbook pro.
I tried it in a co-workers late 2011 2.4 i7 Macbook pro - same thing - the device shows up as a USB 3.0 hub in system information, but does not show up in Disk Utility.
Same Toshiba modelv6300-C 1TB Toshiba
What's wierd as I look at it, the label shows DC+5V 1A.
in System Information it shows the device needing and receiving 500mA, so I will try it on a usb powered hub and see if that helps.

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I would recommend to remove bare drive from the External casing and connect it to a computer directly or via another USB enclosure. If the drive is internally fine you should be able to see and copy the files. If you still get the same symptoms then your clicking hard drive most likely has internal problem with read/write heads and needs head assembly swapped from a donor. It's a very serious problem and recovery procedure in this case requires a lot of experience, use of class 100 clean room and specialized equipment.
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2013-12-26 08:44:06 +0530:
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          Type :           Disk
          Partition Map Scheme :           Unformatted
          Disk Identifier :           disk1
          Media Name :           Seagate FreeAgent GoFlex Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           NA0B3X6P
          Device Tree :           IODeviceTree:/PCI0@0/XHC1@14
          Writable :           Yes
          Ejectable :           Yes
          Location :           External
          Total Capacity :           1.5 TB (1,500,301,909,504 Bytes)
          Disk Number :           1
          Partition Number :           0
          S.M.A.R.T. Status :           Not Supported
2013-12-26 08:44:43 +0530: Preparing to partition disk: “Seagate FreeAgent GoFlex Media”
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2013-12-26 08:44:43 +0530:
2013-12-26 08:44:43 +0530:           Partition 1
2013-12-26 08:44:43 +0530:                     Name                    : “Untitled 1”
2013-12-26 08:44:43 +0530:                     Size                    : 1.5 TB
2013-12-26 08:44:43 +0530:                     File system          : Mac OS Extended (Journaled)
2013-12-26 08:44:43 +0530:
2013-12-26 08:44:43 +0530: Unmounting disk
2013-12-26 08:45:04 +0530: Partition failed for disk Seagate FreeAgent GoFlex Media Unable to write to the last block of the device.

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mjunder Hong Kong
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To be a parrot,.......REMOVE the WD garbageware.
Western Digital warned its users about its OWN software couple months ago.
Remove ANY and ALL WD software products.

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Hi!
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Hi Anders and welcome to Discussions,
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Message was edited by: PHAT ROB

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Hello
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bj10au wrote:
Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
Both drives are Samsung Story external USB drives (one is 1.5 GB and the other is 2 GB) and both have been formatted using Mac Disk Utility with a single Mac OS Extended (Journaled) partition, one using Snow Leopard and the other with Lion.
Both still mount correctly on a friends MacBook Pro that is still running Snow Leopard, and I had no problem with the same drives under Lion. Interestingly both can also be connected to Time Capsule USB port and show up correctly.
Both drives mount correctly under Windows 7 on BootCamp partitions that I have on both the 2012 MacBook Air, a 2009 iMac 27. These BootCamp partitions have Paragon HFS+ installed so I can read Mac formated drives.
Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
I have also tried using Disk Utility 3,2, but still cannot mount the drives, though the program indicates there is no problem with the drives.
I have other portable USB including a Samsung portable USB2 drive, and two external USB3 drives, and I don't have problems with them.
There is clearly a problem with Mountain Lion with accessing (mounting) these Samsung Story USB drives, and the problem appears to be with Mountain Lion itself as the problem did not occur on the same Macs with Lion and does not occur with Bootcamp partitions on the machines.
I have a lot of time searching forums, but I have not found anyone with an identical problem.
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You can start here
http://support.seagate.com/kbimg/flash/213059/213059_EN.HTML
Pete

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Extended Hard Drive Preparation
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AnaMusic: I've tried that but it isn't worked
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