External HD not being recognized

I'm running a Seagate Free Agent Go FW 250GB external HD to back my computer up. Only thing is it isn't being read by my Macbook Pro. The last time I was able to back up my computer was 30 JAN 2012. I'm connecting it to my computer via the two included USB cords which I know are work fine as I can tell power is reaching the drive as the lights are on. I've checked in Disk Utility and my drive doesn't show up their either. I'm running 10.7.5. Any assistance would be greatly appreciated.

First, try a PRAM reset.
This Apple KB article is 10.6 and down but has some good tips in there.
DALE

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Have you tried each and every single suggestion in this Apple support document yet?
iPod not recognized in 'My Computer' and in iTunes for Windows
Has this iPod Shuffle ever been able to successfully connect with this PC and sync with iTunes or is the first time you are connecting the iPod Shuffle to this PC?
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My external HD of 1TB is not being recognized by the iMac and when after a long waiting period it does, the whole computer becomes extremely slow. Do I need any particular add-on to make it workable?

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If there is no recognition of this drive, see if it can be seen in Disk Utility.
If your aim is to transfer the data on it DO NOT use ERASE or PARTITION as these will completely erase all the information on the Drive.
If the drive is present while the Mac sleeps, it is likely to drop out and not be seen any longer, especially if it is a USB-powered drive.

My toshiba external hard drive is not being recognized, except when I eject it. I have the preferences checked to show icon and have checked utilities folder. nothing. Help!

I have a iMac, Yosemite 10.10 and my toshiba external hard drive is not being recognized, except when I eject it!. I have the preferences checked to show icons and have looked in the utilities folder..nothing. I have also changed ports. ??

A few things to try:
1-Repair permissions and restart your computer.
2-Zap the PRAM
3-Use Software Update/App Store to update your OS to OS 10.10.3. Also, update everything SU/AS has to offer for your computer. When done, repair permissions and restart your computer.

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I have been running an Acomdata 500gb FW External Hard Drive for my data intensive applications such as FCP and it has been working flawlessly for about the last year...
Yesterday I powered up the Mac and turned on the drive along with my external USB drive and the Acomdata drive turns on, lights up, and makes noise like it's working, but it is not being recognized at all by the Mac. I tried unplugging it, switching out the FW cord, changing the FW slot it was being plugged into, and everything else of that nature that I could think of. Of course the USB drive that has non-important work related stuff works just fine :/
So I'm wondering, does anyone think the drive has officially crapped out? It turns on and works so I can't tell. I'm PRAYING this is not the case, but I didn't know if there were any possible FW configuration settings that could have been changed or something like that. Any ideas?

Did you recently update to 10.4.10? Is there another computer that you can plug the external into to see if it's recognized? Have you tried plugging another FW peripheral into your main computer to see if it recognizes it?
Some people have had good results from the following:
1. Downloading and installing the combo updater of the system software update they've just applied via "Software Update...". In your case the update you need is at:
10.4.10 combo updater
2. Another trick is to restart each by zapping the parameter RAM:
Zapping the P-RAM:
After the startup tone, hold down <commandd><option><r> until 3 additional startup tones are heard, then release the 4 keys.
3. A 3rd tip would be to do Open Firmware resets on each:
After the startup tone, hold down <command><option><o><f> until the text screen is visible. When text can be entered, type the following commands, followed by the <return> key (there are no space characters in each command):
reset-nvram
set-defaults
reset-all (the Mac will boot up after this command is entered).
Also, see if anything in this Apple KB article helps:
http://docs.info.apple.com/article.html?artnum=88338
Please post back with results,
Miriam

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http://img708.imageshack.us/img708/2116/screenshot20110211at848.png
my external does not get recognized by my laptop unless i use disk utility and click repair. after about 10 minutes of it 'repairing,' it says i have to delete everything off of it and reformat it. it has 40 GB of information and i only have 3 GB left on my computer. talk about yikes.
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angsavestheday wrote:
to back up data. my external was formatted so i could use it on both windows and mac.
You cannot back up to a FAT-formatted volume with Time Machine.
You might be able to partition the drive, so one partition is +Mac OS Extended (Journaled),+ and the other is MS-DOS (FAT) or ExFAT, which both Macs and PCs can read and write, but that's not a particularly good idea, either.
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Your best bet is probably a larger internal HD, so there's room for all your originals, and an external HD for backups (only).
Or two external HDs; one for the "overflow" of things that won't fit on your internal (most or all formatted for a Mac, so Time Machine can back it up along with your internal HD), the other for backups.
You might want to review the [Time Machine Tutorial|http://www.apple.com/findouthow/mac/#timemachinebasics] and perhaps browse [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum).

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Hi,
I added 2 hard drives to my server but they are not being recognized by the operating system. They show in the bios but no where in the OS do they show. They used to be external hard drives but I took the hard drive out and installed them into the server.
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What server hardware is being used? May need the manufacturer chipset and support pack in the case of integrated disk controller.
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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Well now I feel a little silly..
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