SOURCE: USB external hard drive does not show up on OS X desktop
You need to be sure that it is formatted as a FAT32 drive and not as a NTFS. When you are in Vista right click on the drive icon and click on properties. You will see NFTS or FAT32 under file system. Your drive must be FAT32 to be recognized by a Mac. Iomega.com has a FAT32 formatting software that you can download for free on your Vista PC and re-format the drive as a FAT32 drive.
SOURCE: Simple Tech 250 GB external hard drive won't work
I devised these simple steps that tend to remedy quite a few issues with most USB portable / external hard drives and OTHER devices (though not always)
A few things to check but assumes USB and Windows for other interfaces / operating systems (mac/ Linux) similar steps may be adapted to suit.
1. Ensure it is connected directly to the computer to a USB 2.0 port not a USB 1.0 port as this can have effects on performance and reliability
2. Use only the cables that came with it NOT one that fits that may have been lying around or is longer. Not all USB cables are equal even though they should be)
3. Do not connect through an external USB HUB unless that hub is USB 2.0 AND has its own power supply.
4. Use ONLY the power supply that came with it if it has an external power supply Don’t use any other unless you know it has both the same voltage and current rating e.g. 12V 500mA anything rated below that would not work properly.
5. Always use the same port for connecting your devices. Some devices do not like being switched about. If switched they may want to install software / drivers again. This can be especially true if you move a HUB to another port
If you checked and fixed anything there and still have issues then check your hardware from CONTROL PANEL / SYSTEM / HARDWARE.
Any exclamation marks by hardware need fixing before you investigate any further
USB flash drives can fail for no apparent reason.
Sandisk Cruzers are especially bad for this.
USB hard drives should be treated with extreme care.
This is a real hard drive ! and knocks and bumps can quite literally kill them.
It is possible to remove drives from the enclosures in most cases and connect directly inside a PC to fully check it.
Note that if you hear a drive clicking or pinging this could be the worst thing you would hear.
Known as "The Click Of Death"
If none of the above steps help look at updating the drivers from the manufacturers web site in the support section.
SOURCE: maxtor one touch 4 mini 250GB hard drive beeping
I had the same problem and the Maxtor/Seagate website did not have any solutions. I finally got in touch with Tech Support and got a fix. I was using it with a Dell tower and plugging into a USB port in the front. I also was using an after market cable.
I learned the Maxtor is a power hog and beeps and shuts down when it is not getting enough power. I did not know but the USB ports on the front of a desktop/tower computer do not provide as much power as a port on the back (the back ports are sometimes directly connected to the motherboard). I got a USB extension cable and connected it to a USB port in the back and it solved the problem.
I also learned that most laptop USB ports are not powerful enough to run the Maxtor. Mine would also not work if you attempt to share it by using an unpowered USB hub. I have gotten it to work with a powered desktop USB hub (Belkin).
I believe that this may explain why you get a "Y" cable with the drive. I could not find an explaination for the cable or how to use. There may be an accessory to purchase that attached to the cable and powers it.
SOURCE: Hitachi 250GB external hard drive on Mac OSX problem
try to format it in other way like ntfs or fat32....
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