Currently Being ModeratedMar 18, 2013 3:44 PM (in response to DPHolland)
You might try resetting the SMC and pram
Laptops with a battery you can remove
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery.
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Currently Being ModeratedMay 22, 2013 8:04 AM (in response to Mike Sombrio)
Sorry for delay, customer was away!!
Tried all of hse, no success. The drive randomly just loses connction. The connection can be re established by unplugging te drive and rebooting the Macbook. But it does nt keep the connectionagin. eems o drop afte a day or so.
I have since read on hereand elsewhere of lots of users with the same issues, seems a common problem.
Currently Being ModeratedMay 22, 2013 8:26 AM (in response to DPHolland)
What does Disk Utility say? Which format has the disk.
There is an app that has very interesting testing protocols (you may have to install an extra smart driver for an external disk) in Appstore: DriveDx. You can also downoad a trial of that app: http://binaryfruit.com/drivedx.
It does much more than just check the Smart Status.
Currently Being ModeratedMay 23, 2013 2:42 AM (in response to LexSchellings)
Disk Utility reports everything ok. As per my original post, it is partitioned into 2, one for Time Machine, one for data. Both are formatted (with journalling for the TM partition).
The disk works perfectly fine on my iac running 10.8.3.
I suspect it is a USB problem on the Mac Book.
Currently Being ModeratedMay 23, 2013 3:55 AM (in response to DPHolland)
In SystemInformation, check the Diagnostics, and the USB in the hardware section, if nothing special, use the Apple Hardware Test.
BTW: did you format both partitions the same or different?