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The MAC is not recognizing HDD because it may not be in FAT or MAC OS X Journeled Format. Please Follow below steps to Reformat the HDD to make it Compatible with MAC.
1. Connect the HDD. 2. Open Disk Utility from Applications -> Utilities 3. On left side of Disk Utility you'll find your HDD. 4. Click on HDD and select the Format TAB. 5. Reformat the HDD in Mac OSX Journeled Format. 6. Click Apply. 7. Done.
P.S. : It will erase everything from your HDD so remember to backup all data before doing this.
Could be, the product is actually just defective, right out of the box.
An item's compatibility may be limited, too; in that maybe you should
try running your OSX's Disk Utility on that external drive, and if need
be, reformat it to a more compatible Mac extended format. I'd never
take a new 'compatible' hard disk drive at face value, as being so...!
Disk Utility can do several things on a drive; low-level reformat where
it writes zeros over the contents, repair a drive, repair permissions
when an OSX volume is on the drive (as in a backup clone) & etc.
If you can get it erased, reformatted, etc, and it still won't work, check
with the supplier or retailer on getting a replacement under warranty.
Is it formatted in NTFS? OSX will read most formats but cannot write to NTFS.
I would suggest that you copy all your files from the drive on to the Mac then use disk utility to reformat the drive in the native Mac format and then copy everything back again.
You may find that once formatted, Time machine will pop up and ask if you want to use the drive as your time-machine back-up. If the drive is the same size as the Mac's drive (or smaller) I would say NO and get a larger drive to use for TM.
If you need to connect the drive to a windows machine at all then don't use the native format (HFS+), use FAT instead. The mac can work with that (although it will probably mess up your files names).
I had a similar issue with my Maxtor Basics portable 500GB drive. I hadn't formatted mine yet, but had heard there were issues, so decided to find out before I start. I even saw your post here looking for an answer. Finally, one of my friends told me the following solution, which worked fine for me:
Don't format the drive as any of the Mac OS Extended options, simply reformat it as MS-DOS (it should be one of the options in Disk Utilities when you choose Erase and go to the Volume Format dropdown list).
Your Mac should be able to recognise and use the drive in this format and it works for PCs. Transferring files between the two shouldn't be a problem.
A thing to note, though, is that these Maxtor drives apparently come ready-formatted as MS-DOS (mine did). But while my Mac recognised the drive, I couldn't copy files on to it. If this happens, erase this MS-DOS formatting with... MS-DOS. Don't ask me why this works, I'm not a Mac Genius, but now my Maxtor is trouble-free and can transfer files from PC to Mac and back again.
To isolate the problem, please try the steps below:
1. Make sure that the USB ports of your PC are working. 2. Try to connect the device into different USB ports. 3. Try to connect it into different Windows based computer.
Question: Did you reformat this device using your Mac? If yes, there could be a possibility that the device was reformatted using the Mac OSX (Journaled). This type of format would only recognized by Mac computers.
But if it's formatted using the DOS based system, it would work on both Mac and PC.
I found the solution here:
but short version of it all: Basically
you just need to format the drive to get it working. Open up disk utility. Selecting the maxtor drive on the left in disk
utility. Then select the erase tab. Then change MS-DOS (FAT) to Mac OS
Extended. Finish by clicking erase.
Mine didn't work at first even though I plugged it in but after I did that it worked. Hope you can
get yours working too!
You didn't specify if the original PC was Windows or MAC.
Is this USB external used on a PC with
Windows? If so is it formatted NTFS?
If so, Mac OSX and pretty much everything else but windows NT, 2k and
XP can not write to NTFS. OSX and Linux will read an NTFS partition but
at this time not write to it. If your drive
is formatted NTFS, I would say, go to a windows machine and convert it
to a FAT 32 Partition. Most everything will both read and write to