Portable Hard Drive will not show up in Disk Utility

Question

I purchased a Toshiba Canvio Slim 500 GB hard drive a few months ago before I updated my computer to Mac OSX Version 10.6.8. I was running out of Hard Drive Space since I bought my computer in 2009 and decided to use a portable hard drive to store some of my personal information. I was able to read and successfully transfer data to the hard drive, but then I updated my computer to 10.6.8 and now I can't access it at all. It won't even show up in Disk Utility. I read on a few forums that some people were having the same problem as I was and they bought a y-cable adapter to power the hard drive through two usb cables. I bought one and tried it out and I'm still not having any luck. I tried using my girlfriend's computer to see if I can access it from her computer and it shows up in disk utility, but I can't access it. The lights turn on and I can hear it working like it worked the first day I used it, but nothing is happening. Please help me fix the problem.

Answer 1

Evidence, as scant as it is from Disk Utility, suggests the Toshiba external
HDD is indeed without Partion Map Scheme, has no files on it, unformatted.
So I wonder if there isn't a wire or defective circuit inside the box (enclosure)
that may be hiding access to the actual HDD unit inside there. Those kinds
of enclosures generally use a laptop 2.5" HDD since they can run on USB
power from the port. Matching up the internal HDD from that case, with an
other one with correct life support (connections) is a way to test it.
However if the Toshiba HD is a 3.5" standard drive, a larger enclosure, or
an adapter that simply plugs into the connections of the bare hard drive,
would be a way to access that external drive. These 'drive adapters' can
work with both SATA and IDE hard drives; or just one of the two. They
run in the range of $40 or so, and essentially are a wire kit with a power
adapter to spin the drive, but some do not even have the adapter, so as
to still use USB power for smaller drives of slower disc RPM speed.
Most competent computer stores with a skilled staff would know of these.
However some of the smaller HDD enclosures may be hard to open up.
And if there were a Toshiba warranty, this action could void the same.
Adapters would be to 'test the idea of recovering any data,' if enclosure
the drive shipped in has somehow developed a defect. Though it may
be if there is a defect, it may have existed at a point in time to affect
the actual save-to-disk process. Or later. A wire could be not allowing
information to be received, if broken or circuit damages, by the Mac.
But by the look of the Disk Utility's partition map, along with the other
earlier image that shows the same info in the bottom of the image of
the status, in Disk Description, this does not bode well for recovery.
I'm not sure what else to suggest. When the dust settles, Toshiba may
have a residual warranty that could only replace that one with another.
Some older mailorder catalogs show these kinds of adapters, some use
USB port power, others also include an AC adapter so standard faster
HDDs can be used without an enclosure. This also helps if one wants
temporary access to a hard disk drive, but does not want to install it.
•USB drive cable adapter kit SATA and IDE HDD - google results:
https://www.google.com/#q=USB+drive+cable+adapter+kit+SATA+and+IDE+HDD
Companies also make hot-swap docks to allow fast swapping of HDDs
of either or both 2.5" and 3.5" size, these have their own adapter and
one simply puts drives inside from the top, like a bread toaster.
Hopefully you can take the Toshiba along to a computer store and ask
a somewhat skilled person there about getting the cable adapter kit or
another enclosure. The cable adapter would cost less & be quicker, yet
that would still involve opening up the failed HDD's enclosure for access.
Good luck & happy computing!