The external hard drive is not recognized by my macbook pro (yosemite).

The external hard drive that was recognized by my older iMac (snow lion), is not recognized by my new macbook pro (yosemite).
Can anyone help me with this? Thank you!

Can you see the drive in Disk Utility?
See mount section in 1st linked article.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

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New hard drive is not recognized by my MacBook Pro. The supplier says I need to update my BIOS. True? How do I do that?
Hard drive: NN2-72-500-SSE Seagate Momentus 7200.4 (ST9500423AS) 500GB Laptop Hard Drive
Mac OS: Mac OS X Lion 10.7.5

I went through a similar issue with a Seagate Momentus 750GB HDD/8GB SSD with my late-2011 MBP. No matter what I tried, the machine would not recognize the drive.
To test it, I installed the drive in an old ThinkPad, and it worked fine. Then I tried installing it in my PS3, and the drive worked fine there, too. It was only the MBP which had issues.
I don't *think* Macs have a BIOS to update. But I know my MBP has issues with certain HDD's (including another external which works fine on other Macs and all Windows machines).
You might be able to find my thread by searching under my username, perhaps something in there will offer a tip. Otherwise, you might have to go the same route I did: install a WD Scorpio Black instead. Or upgrade to an SSD.
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My WD 2tb external hard drive will not unmount from my MacBook Pro. It no longer even shows up in finder, however it does show up in Disk Utility. I have tired so many of the suggestions on the internet all to a fail.
I keep getting the message to be sure that all applications are closed before ejecting the drive. I have no clue how to tell which appliactions are using the external drive to shut them off. I turned off Time Machiene to be safe.
I don't need anything on the external drive, I am just trying to erase it, save my current info, and migrate it to my new MacBook Pro.
I have been about four days now with this issue all over the internet, in this community, and watching videos on everything and nothing about this topic to a fail.
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Does anyone have a solution?

Have you trie using another USB port? Can you test the USB ports with other USB devices to assure they are working? You may want to reinstall OS X in case there has been a driver glitch.
Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.

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Hi all,
I use my external hard drive to save a document from another PC computer last week when I plugged it back on my Mac the documents cannot be read on a Mac as it says they are not supports by apps software or search for application that will open those files.
I have all the documents which I copy from my previous Toshiba Laptop which was windows7 but is there way to clean the external drive on Mac without loosing all the document? or how do I format my external hard disk on MacBook Pro?
Jok2

You can copy these documents to the internal drive of your MacBook Pro and then, format the external drive. If you want to use the external drive on Macs and PCs, I recommend you to format your external drive on a PC to use exFAT, better than NTFS or FAT32. You can also use FAT32 but it isn't compatible with files bigger than 4 GB, and NTFS disks can't be written on Macs. If you want to use this external drive only with your Mac, you can use Disk Utility to format the external drive using "Mac OS Extended (Journaled)". Read > http://pondini.org/OSX/DU1.html
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Pls note my system is being run on safe mode, as there is a problem in the left shif key. Hence, while booting, it is automatically being shifted to the safe mode. I need to format the external HD, so that I can transfer to store my data.

If you want the drive to be able to both read and write on OS X and a Windows machine, you should format the drive as exFAT on the Windows machine. As to why the drive is not recognized when you boot into Safe Mode, that may be because the drive is formatted for another OS and it MAY BE that it's disabled when you run in Safe Mode (which disables a long list of things: see -> http://support.apple.com/kb/HT1564?viewlocale=en_US).
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My external hard drive is not recognized by my computer. I used it earlier and it was fine however my computer froze and I unplugged my hard drive without properly ejecting it. Now when I plug it in nothing pops up. I've tried on three different computers and no luck. I hope this is fixable! Please help.

Care to share which OS you are using?
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That's a bummer, didn't realize the exHD files were corrupt, esp if you have tried from another PC and not just this new computer.
You can get purchases from the itunes store transferred from an iPod using these directions:
http://support.apple.com/kb/HT1848?viewlocale=en_US
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For a couple of months i have been backing up my stuff on an external hard drive (Verbatim) no probs.
Last time I didn't close the external hard drive down properly. Now my Macbook does not recognize the external HD any more.
I have tested the external HD on other PC and it still works fine.
How can I change my settings or do something else to have my Macbook recognize is it again.
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Whenever an external drive is disconnected without first being ejected or dismounted, file system corruption is a very real, perhaps even likely, possibility. If that has happened you might try repairing it with Disk Warrior:http://www.alsoft.com/diskwarrior/
Message was edited by: macbig

I want to upgrade my Hard Drive to 1TB and more. What is the maximun Hard Drive I can install for a MacBook Pro 2009 Yesterday, I tried a SEAGATE SSHD but my screen was always a showing a QUESTION MARK (?). It's not the cable because when I put back

I want to upgrade my Hard Drive to 1TB and more.
What is the maximun Hard Drive I can install for a MacBook Pro 2009
Yesterday, I tried a SEAGATE SSHD but my screen was always a showing a QUESTION MARK (?). It's not the cable because when I put back the old original version, everything works...Any sugestion of brabnding or procédure to upgrade my hard drive?

The largest 2.5" dia SATA drives available are 2 TB in capacity.
Have you tried the Seagate SSHD connected externally to the MBP via USB? The drive itself may be faulty.
Ciao.
Here is a good place to start looking for a replacement drive:
http://eshop.macsales.com/shop/hard-drives/2.5-Notebook/

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I just tried this, no luck...
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Im familiar with that HD, I have one currently disassembled for just the bare HD...., it has a removable SATA bridge, if the HD wont spin up but the light comes on, on the HD, then the SATA bridge is bad.
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What did you old Macbook die from? Likely the HD in it is still ok, yes?
You can remove the HD inside your old dead Mac and put it into a $20 HD enclosure or HD dock, and remove the photos that way, very easy.........IF your old Macbook died from something other than ALSO a bad HD.
You said----my OLD Macbook pro which recently lost video
What happened with your old "dead" macbook? Still have it?

The external hard drive is not recognized by my macbook pro (yosemite).

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