SSD won't mount

I added an OWC 240GB SSD to my 17" MBP a couple of years ago and installed Trim Enabler. Everything was dandy until yesterday when my computer somehow updated itself to Yosemite and I was faced with the "grey screen of death". I had an empty external drive already hooked up so I went ahead and installed Yosemite on it and copied up my latest Time Machine backup onto it. Starts up fine but I need to get my SSD back online. After researching I figured out that Trim Enabler and Yosemite were now bitter enemies.
I am just trying to figure out now how to "disable" Trim Enabler from the SSD. Since I can't access the drive through Disc Utilities I'm not sure how to go about doing this. Do I have to take the drive out and hook it up as an external to disable Trim Enabler? Will that even work? I've since come to find out that Trim Enabler isn't really even necessary on the OWC Mercury that I have.
Help please!!!
Thanks!

Install OS X Using Internet Recovery
Boot from your external drive's Recovery HD. When the Utilities Menu appears:
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use.
This should restore the version of OS X originally pre-installed on the computer.
TRIM should no longer be enabled on the SSD. Had you read the information from OWC then you would have known that they do not recommend using TRIM.

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Thunderbolt external SSD won't mount

I'm using the Elgato Thunderbolt SSD as an external hard disk with my 2013 MBP. Since I'm also using a Thunderbolt display, I usually daisy-chain the disk to the display.
Recently I disconnected the Thunderbolt display from my computer without unmounting the external SSD. Since this also disconnected the disk, I got the usual ticking-off ("You should eject a disk before disconnecting it").
However... since then, the external disk won't mount. It doesn't show up on the desktop or in Disk Utility, though it DOES show up ("Thunderbolt SSD") in System Information.
Because the SSD gets warm when it's in use, I think it's still working. I just can't access it.
Can anyone help?

Is the Apple Thunderbolt Display at the END of the daisy-chain? That's where it should be - all other TB devices should be connected first, with the Display at the end of the chain.
As to why you're having a problem getting the TB SSD to work, I'm stumped. It seems as if you've done everything that I would try to do to get everything working... and I'm assuming that you have powered down and unplugged the Display and all other devices for 15 minutes or so?
Just make sure that the Display is at the end of the TB chain - that's really the only advice that I can offer.
Clinton

SSD won't mount - SATA compatibility issue

I have iMac 1.9 Ghz G5 (iSight) and I want to change my hard drive with SSD.
I was kind of in a hurry, so I did not read enough I bought a Adata 2.5"SATA 6Gb/s SSD.
After installing it in to my iMac it won't mount. (I'm booting the Apple Mac OS X Install DVD from external hard disk (CD/DVD not working). I know I have to format the SSD before installing the OS, but if I can not do this in Diskutility because it is not visible)
My questions are:
Is it possible that this SSD is not compatible with my computer?
There is no information for this particular model if it is compatible with the SATA 1.5 Gb/s port on the iMac G5.
If it actually is incompatible...
What kind of SSD (brand/model/SATA/speed) is the best to use in this upgrade situation?
I'd rather not have to buy a new high performance SSD and just not get the full benefit from it, so I'm looking for an ssd that's both faster than a mechanical drive, but also that isn't all that expensive.

Try checking at http://macsales.com
You can phone them or echat, they are very knowledgeable and will point you in the right direction.

Crucial SSD won't mount on my Macbook Pro 13" early 2011

Hi, a brand new Crucial SSD in a brand new 2.5" USB3 enclosure won't mount on my Macbook Pro 13" early 2011.
Any help would be appreciated, thanks

Try different USB cables.
Try a different enclosure.
Try all USB ports.
Try it on another Mac.
Is no success, the SSD may be DOA.
Ciao.

My 3rd Party SSD won't mount

I am having trouble because I can't tell exactly what my problem is, in order to find the solution.
I have just installed a Crucial M500 SSD into a Macbook Pro. I installed and time machine'd it as an external drive, and it booted just fine (using the Option Key).
I put it inside the MBP, and I go automatically to Recovery. I can't mount the drive.
It's unclear to me if this is some kind of OS X problem, or if this is because of the 3rd party SSD issue that so many are plagued with, since Apple decided to lock down kext signing.
Regarding the Yosemite SSD problem, everyone on the internet points to this:
http://www.cindori.org/Trim-enabler-and-yosemite/
But this assumes the drive can be mounted. My Macintosh HD volume is grayed out and can't be mounted.
I have confirmed the drive is fine and the cable is fine, because the original HDD works fine if I put it back in the Mac, and the SSD works fine if I put it back in an enclosure.
I've already done the installation and time machine process twice, with the same results. Repeated attempts to repair and erase have resulted in worse results, until I took the SSD out, used it externally again, and put it back in.
I could really use some sage guidance here!

I gave you steps but not what to do at each step. So, you need to first boot from the external drive that holds your original system:
Boot Using OPTION key:
1. Restart the computer.
2. Immediately after the chime press and hold down the
      "OPTION" key.
3. Release the key when the boot manager appears.
4. Select the external disk icon.
5. Click on the arrow button below the icon.
Next, you need to repartition and reformat the SSD which is now the internal drive:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Now, you need to boot from the Recovery HD that is located on your now external drive:
Boot Using OPTION key:
1. Restart the computer.
2. Immediately after the chime press and hold down the
      "OPTION" key.
3. Release the key when the boot manager appears.
4. Select the Recovery HD icon. If there are two DO NOT use the one labeled 10.10.
5. Click on the arrow button below the icon.
When the Utilities Menu appears:
Clone using Restore Option of Disk Utility
1. Open Disk Utility in the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Select the destination volume from the left side list and drag
       it to the Destination entry field.
5. Select the source volume from the left side list and drag it to
      the Source entry field.
6. Double-check you got it right, then click on the Restore button.
Destination means the internal new SSD. Source means the external former internal drive.
Upon completion quit Disk Utility. From the Apple menu in the screen menubar select Set Startup Disk. Set it to the internal SSD. Select Restart.

New Lacie Rugged Thunderbolt External Drive won't mount on Macbook Pro 8,1

I've searched, and am coming up empty handed. Any help would be appreciated.
So I own a late 2011 Macbook Pro 8,1. that's running version 10.9.5.
I bought a brand new Lacie Rugged Thunderbolt External HD that won't mount via Thunderbolt, though it works fine with the USB. Any ideas as to why the Thunderbolt connection isn't working?

Silly question, but - did the drive come with a Thunderbolt cable or did you purchase one with the drive?
Call back...
Clinton
MacBook Pro (15-inch Late 2011), OS X Mavericks 10.9.5, 16GB Crucial RAM, Crucial M500 960GB SSD, 27” Apple Thunderbolt Display

Can't install Snow Leopard on MacBook Pro - DVD won't mount

I am unable to install Snow Leopard on my MacBook Pro as the DVD won't mount. This is an early 2008 vintage MacBook Pro, intel core duo...
I'm using a OS X Snow Leopard install DVD (family licensed). This DVD has been used to install 3 other Macs in my house without a problem (about a year ago), but cannot be used to upgrade my MBP. Actually, this disk mounted on the MBP exactly once - inserted with system up, the disk mounted. Upon running the installed (a year ago), the computer restarted but hung in boot. After getting the disk ejected and the computer restarted, the disk would never mount again. I've defered upgrade for a year but at this point need to upgrade my MBP at least to Snow Leopard and possibly Lion.
The problem doesn't seem to be with the DVD, since it continues to mount fine in other computers, and in fact a borrowed Snow Leopard DVD also will not mount on the MBP.
BUT ... the problem also does not seem to be with the optical drive in my computer, as it can read & mount the install/restore disks that came with the computer as well as other CDs and DVD ROMs. Only the Snow Leopard install DVDs fail to mount.
I've also tried mounting the 10.6 install DVD on my Mac Pro desktop, making it available over the network (ethernet) with DVD/CD sharing. I can mount the remote disk from my MBP that way, but when I launch the installer, the application launches (its own menus are displayed, I can quit from menu, for example) but does nothing -- no windows open, nothing.
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Zapping the PRAM did not help.
Am off to the store to get an optical drive cleaning kit and a blank DVD big enough to burn a new disk image, but would appreciate any further ideas at this point....

Solution that worked: Copy the Install DVD to a USB flash drive and boot from that.
http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
Up and running with Snow Leopard now and working on the updates.

I have a MacBook Pro and an 1TB WD my passport for mac. I bought a second hard drive to act as back up and when I went to do this the original passport won't mount. It is showing in disc utility but it will not repair. I am told the mac cannot repair it.

I have a MacBook Pro and an 1TB WD my passport for mac. I bought a second hard drive to act as back up and when I went to do this the original passport won't mount. It is showing in disc utility but it will not repair. I am told the mac cannot repair it and I need to back up the files and then restore the hard drive. But I can't open the hard drive to move the files onto the new one!
Help me please. I am not very technical so please answer as if I have no clue!! This hard drive has my iPhoto on it and all my pictures of my son, wedding and my current photography course so I desperate to get it back!
Any help will he appreciated!

disk0s2: I/O error.
disk0s2: I/O error.
The MBP's disk is damaged and requires replacement.
Genius Bar Reservations: http://www.apple.com/retail/geniusbar/

Urgent - I think I just lost everything on my MacBook Pro. Hard drive won't mount and booting up shows "no" symbol

My MacBook Pro (13" mid 2010, Yosemite) doesn't feel like booting up. It gives me the no symbol after the progress bar is about 1/4 of the way through.
Additionally, it won't mount in the Recovery HD. It shows up as disk0s6 and clicking Mount does nothing. Can't seem to mount it in the Terminal either.
The disk partition is encrypted, so unfortunately I can't pull the hard drive out of my MBP and pull the stuff off it with my PC.
I tried First Aid - "no problems found" (such LIES!)
I tried PRAM - didn't work
I tried Verbose Mode - went fine for the first minute, then hung for a while before returning to the "No" screen and in the bottom right corner "Still waiting for root drive".
I tried SMC - didn't work
Most recently I did install rEFInd - which is a boot manager. I was afraid it screwed up the EFI partition -seemingly not, as it will boot to Recovery and external drives.
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Do you know what would be causing this? I really need that data back :/

It appears I can unlock the partition, using diskutil via the Terminal (diskutil coreStorage unlockVolume <UUID> -passphrase <passphrase>).
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Additionally when I use diskutil coreStorage list, it comes up with nothing. I'm at a loss here, the partition doesn't even know it's own UUID or that it's encrypted. It seems quite damaged to me but I don't have the slightest idea why, as I CAN boot to it and enter the password but it will stop at the "no" symbol part of the way along.

Ipod classic won't mount after updating to itunes 11.0.2

ipod classic won't mount after updating to itunes 11.0.2.
I updated to itunes 11.0.2 today, after delaying it for a looong time (I have it @ work and don't like the new layout).
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I've restarted the ipods 10+ times each.
All of the ipods DO show up on my desktop though. Just not in itunes anywhere with 11.0.2.
One more thing: It's not the cables or the ipods: they both mount fine when connected to my laptop (running old *** 10.4.11 and itunes 9.)
Machine is a Mac Pro running 10.6.8.

Finding this Post took some time but I thought it was me talking when I read it. I was having the exact same issue. I have a G3 I've been upgrading like mad, including a Sonnet G4-500 CPU a Maxtor 60gb & 80gb HDs 1gb of RAM a new LaCie Firewire800 PCI card Graphics card etc. the latest was installing Panther 10.3.9 on the new 80gb HD and also swapping out the old CD-ROM and replacing with the (Apple standard) Pioneer DVD-RW DVR-110D combo drive in it's place. got everything up and booted and poof! no burning. Toast worked read/write no problem. iTunes could read and import no problem, but wouldn't burn a CD.
Downloaded "PatchBurn 3.1.3" installed, re-booted and all is OK in burner land again :>)
I wanted to just post my additional thanks to the lead to Patchburner, and I'm going to donate to the cause. It's worth a $20 donation just for my joy of not throwing this computer out the window!!

Upgraded to Mavericks. Now External HDD Enclosure Won't Mount. Is there a fix?

Upgraded to Mavericks. Now I can't get my external HDD enclosure to mount. A little about this enclosure, as it's not the usual settup . I have four 3TB HDDs in a RAID5 settup. The most unique part is that they are formatted as a Windows NT Filesystem (Tuxera NTFS). Basically, when I set this up, I had to get a lot of info from a Windows-formatted HDD, but also be able to read/write afterwards. It's worked fine for ~ 1 year, but now that I've upgraded to Mavericks, nothing will mount. I ran Disk Utility, where I see the HDDs (I've partitioned them into four drives of varying sizes), but they are greyed out. I tried to mount them, but it says it won't and that I should run First Aid. So I did...tried to "Repair Disk," but it just gets stuck on "Updating boot support partitions for the volume as required." For over an hour it's been on that message.
So, does anybody out there have a fix? I've read several similar posts about people having a hard time mounting and, overall, dealing with external HDDs after upgrading to Mavericks. But nothing seemed to fit my exact circumstances. Lastly, I should mention that I've used both Firewire and USB connections. Both resulted in the same.
Thanks.

I can't help with specifics for your issue, but some general thoughts:
The upgrade and the disk problem may be a coincidence. It would help you if you could verify that the drive still works fine on a windows machine. If you run a windows virtual machine or have a windows pc, or a friend does, verify full functioning that way. If it still won't mount on the mac, try to copy/backup it's data onto the windows machine (maybe another external drive connected to it. You could then scrub the disk in windows, leave it unpartitioned, unformatted. Connect it back to the mac and format it as HFS+ (Mac extended journalled) and transfer the data back to it by sharing the windows machine external drive and connecting the two machines with a network cable.

Time Capsule won't mount after upgrade to iTunes 9

See my full post in the Time Capsule support section ("Help! Time Capsule won't mount after installing iTunes 9"). My music library is on my Time Capsule, but after installing iTunes 9, it won't mount on my iMac G5. I can use the internet, but the disk won't mount. My Powerbook hasn't been updated yet and the Time Capsule mounts fine.

To make it easier, here's the post:
"My music library is on my 500 Gb Time Capsule. I just installed iTunes 9 on my iMac. It updated my library and synced my iPhone. Now, the TC won't mount. I still have internet connectivity, but I can't access my media or print to my printer connected to the TC. I can use the computer and everything, but if I hover my mouse over the TC disks menu bar icon, I get the spinning beach ball there. If I try to connect using my Network icon in the sidebar, it allows me to log in and get to the screen to select the volume I want to mount, then stops responding. In the Activity Monitor, AFP Client & AirPort Base Station Agent are not responding. I also have a Powerbook G4 w/Leopard (10.5.8) which hasn't been updated to iTunes 9 yet. The Time Capsule mounted fine on it."

How do I erase and external HD that won't mount?

Help! I bought an Iomega eGo drive from Amazon. I backed up my MacBook Pro and my work on this drive. Now it won't mount and I want to send it back to Amazon. I tried disk utility, Disk Warrior and plugging it into other Macs. It has firewire 400 & 800 and usb. Nothing from all of them. How d I get my personal stuff off so I can return this hunk of junk? (my 2nd one! I never learn.)
Any help or ideas would be very much appreciated!
Thanks!

Just to add to the previous, if you use "System Profiler" (in your Utility Folder) and look under which ever interface you have it connected through, does the "bridge" in the enclosure itself at least appear, even if the drive itself doesn't? If it DOES, then the problem either lies with the drive or with its connection to external enclosure's "bridge". If even the "bridge"/ enclosure itself doesn't appear then the problem is either with the bridge/enclosure itself, the cable you are using, or the port you are using on the Mac (as the drive doesn't surface under any of three connection methods you can pretty much disregard the last two).
If the bridge is dead, then the only way you will be able to erase the drive is by removing it from the enclosure and putting it in another one (which will almost certainly void any warranty).
If the bridge appears, but the drive does not, then it is probably the drive itself which is dead, in which case you won't be able to erase it anyway, but no-one is likely to bother going through the expensive and time consuming process of seeing what is on it by removing platters etc! Most techs in the warranty departments of major companies like Iomega are overworked, underpaid, and trying to avoid additional work. They just won't be interested in the content. Dead drive, into the bin, onto the next one! As you say yourself, such failures with Iomega drives unfortunately aren't exactly worthy of headlines!
If Disk Utility can "see" it, though, even if it won't mount it, then there may be some other options for wiping data before sending it back.
Cheers
Rod

New partition on external hard drive won't mount

I have an 2TB external drive connected by FireWire to my 24-inch, Early 2009 iMac. I created 2 partitions 1 that is about 35 GB and another that is the rest of the 2TB. The 2nd largest partition mounts fine and is being used by Time Machine for my back up. The 2nd one I wanted to use for a Tech Tool Pro eDrive. However the 35 GB drive won't mount. Well it mounts, but after a few seconds it unmounts itself. This is the message I get as it unmounts itself:
8/18/13 7:18:45.788 PM fseventsd[43]: Events arrived for /Volumes/eDrive after an unmount request! Re-initializing.
8/18/13 7:18:45.789 PM fseventsd[43]: creating a dls for /Volumes/eDrive but it already has one...
8/18/13 7:18:46.039 PM fseventsd[43]: disk logger: failed to open output file /Volumes/eDrive/.fseventsd/00000000030d4f84 (No such file or directory). mount point /Volumes/eDrive/.fseventsd
8/18/13 7:18:46.039 PM fseventsd[43]: disk logger: failed to open output file /Volumes/eDrive/.fseventsd/00000000030d4f84 (No such file or directory). mount point /Volumes/eDrive/.fseventsd
Any ideas?
I've checked the partition with Disk Utility and no errors.
Regards,
Chris Johnson

If the drive has more than one interface (USB, FireWire, Thunderbolt, eSATA), try one of the other interfaces.
Check that the data cable is securely inserted at both ends.
Try a different cable.
If you're connecting the drive through a hub, connect it directly to a built-in port on the Mac.
If you're connecting it directly, try a different port.
Disconnect all other devices on the bus, or as many as possible.
Test the drive with another Mac. Test another drive with this Mac.
If the drive is bus-powered, but has an AC adapter, connect the adapter.
Boot into Recovery and launch Disk Utility. Does the volume mount?
Start up in Safe Mode and test.
If the drive doesn't work under any of the above conditions, and if another drive does work with the same Mac, then the drive has failed. You may be able to salvage the mechanism by removing it from the enclosure and installing it in another one, or in a drive dock.

External Hard Drive Won't Mount- Need to recover files

Hello Everyone,
I am hoping that one of you fine mac experts may be able to assist ~
Problem: External Seagate FreeAgent Desktop USB external hard drive
won't mount on desktop=ie: no access to my important files.. Please Help!
Details:
External seagate freeagent 500 GB Desktop USB HD ( only 2 months old)
(using for document / file backup-not as a startup disc)
on my Mac G3 350 MZ Blue & White Tower /768 ram/ running OSX 10.1.5 & OS9.2~
~
Problem: Started using the external 500 GB HD 2 months ago -with no problems-until this morning. Tried to double click to open it to access files
and got the "beach ball of death" and needed to restart.
My trusty G3 started up fine, however, the external HD was now
not showing up on the desktop as normal. I troubleshooted -by restarting,
trying different a/c plugs/ different USB ports , ran disk utility..called
seagate -not much help . Seagate said to try the HD on another mac-which I did-
a G5 tower- same problem.
~
The External hard drive will show up in disk utility, but is grayed out.
and when click "mount" same two messages keep showing:
message 1: "a disk attempting to mount as unknown has failed verification or has failed to
mount.please use disk utility to check the disk"
~
message 2- when unplugging and repluggin the usb in-and upon
restart:" you have inserted a disk containg no volumes that mac osx
can read to use unreadable volumes,click initialize to continue with the disk inserted ,click continue"
~
( I really need access to these files- and do not want to re-initialize the HD!!)
I ran Disk Utility /first aid "verify & repair , the following info came up:
Repairing disk "main backup 2007 ".
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid key length ( <<<IN RED )
Repair completed. "
~~
Though it said the repair was completed, the "invalid key length" issue
still comes up when re-running disk utility...Hard drive would still not
mount on desktop-even after restarting .
~~~~~
If there is a mac genius out there that can help?- it would be greatly
appreciated. I have tried to call seagate several times in the last several hours-
1st time-they disconnected me after being on hold 10 minutes-2nd call
I was put on hold for 40 minutes ..Finally spoke to someone ( they are not mac users or mac experts!)and he said I would need to send it to Seagate's Data Recovery-... for a fee of course!
~~~
At this point, I am hoping to just get the files and photos off
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what version?
Thank you very much!
L

Will zapping the PRAM be of any use in getting the external to mount on the desktop?
Your external Hard drive is already recognized. But it cannot be mounted on the desktop due to its directory damage. You can certainly Zap the PRAM, and it will not hurt anything, but I am skeptical that it will change the situation.
Do you think the Disk Warrior 4.0 cd will even work on my G3 350MHZ running Mac OS 10.1.5?
If you boot from the CD and run it from the CD, absolutely yes. If you attempt to INSTALL it from a download or a CD, probably not.
Have you ever used Disc Warrior and is using it complicated?
I own and use Disk Warrior. You select the drive to be rebuilt, it builds a proposed new directory from the information and file fragments available.
When complete, it will provide a list of problems encountered, tell you what files have been placed in the "Rescued Items" folder, and allow you too look at your drive using the proposed new directory. Your only decision is whether the new directory seems to be an improvement over the old \[in your case, hopelessly corrupted] directory. You then tell it whether to replace the old directory with the proposed new directory, or to abandon its work and leave your Hard Drive unchanged.
Is there a good chance that the ext HD will still have my files on it- or do you think from what I've described that they are gone ?
From what you have described, your files are very likely to still be there. Sometimes in a situation like this, a handful of files cannot be recovered.
My other thought was to take the external HD there and have them try to recover the files.
Make sure you completely understand the costs involved. File recovery using a service like DriveSavers can run into many hundreds of dollars. They are prepared to disassemble your drive in a clean room and replace controller boards and read/write heads to achieve success. Your drive has serious, but not fatal, Directory damage. The Hardware, and most of your files, are likely just fine.

SSD won't mount

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