External FW 400 G-Drive stopped mounting

Suddenly, one of my external G-Drives stopped mounting. Shows up in Disk utility as unmounted. Shows up in system profiler, but won't show up in Tech Tools Pro4. Has it died?
Boe

If the drive is connected via USB and is "bus-powered" (does not have its own power brick), the USB port on the computer may not be providing enough power. That can cause the drive to be inaccessible even though its electronics show up in DU.
If you don't wish to replace the drive with one that brings its own power brick to the party, you can usually overcome this by getting an inexpensive powered hub, again, one with its own power supply.
On the surface, the above recommendation seems ludicrous in that a bus-powered device that once worked stopped working later. However, some electronic devices can demand more power as they age.

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Drives stopped mounting with FW800, but FW400 is OK. Worked OK before, but won't now. Tried new cables, zapping pram, Disk Repair Utility. Any suggestions? Thanks.

Drives stopped mounting with FW800, but FW400 is OK. Worked OK before, but won't now. Tried new cables, zapping pram, Disk Repair Utility. Any suggestions? Thanks.

If your external drive does not have an independent power supply, you may wish to consider a couple of lower-cost options before tossing the drive. Bus-powered drives have no external power source and must get all their power from the computer. They can exceed the computer's USB energy budget.
Cheapest option:
1 Meter USB 2.0 A to 5 Pin Mini B Cable - Auxiliary USB "Y" Power Design for external hard drives.
This gets power from two of the computers USB porst sna can provide enough power to wake up an under-performaing bus-powered drive.
If you don't have enough ports to use this, try the next cheapest option:
Newer Technology 7 Port Hi-Speed USB 2.0 Hub with Power Adapter for Mac & PC
Such a hub has a an independent power supply to make up for wahat the comptuer fails to provide.

Are (some) external firewire 400 hard drives just cased sata drives?

Are (some) external firewire 400 hard drives just cased sata drives? If so, I think I'd like to bust open my external 160GB Lacie and mount it internally...
I have no idea if they are or not, it just crossed my mind at one point.

Possible but unlikely. PATA drive remain less expensive in bulk and PATA ->FW enclosures are more mature and wide spread than SATA->FW. Larger drive cap. drives are more likely to be SATA.

External FireWire Drive Stops Mounting

Friends,
I did quite a bit of searching on this, and didn't find any answers. I have a 160 GB external FireWire that suddenly won't mount on my eMac, running the latest OS X. I store all my music and all my photos and videos on the drive. I can see it in Disk Utility still, but can't Repair or Verify (those buttons are grayed out). I can also see it in the System Profiler. The only thing I can't do, is mount it, or read it from my eMac.
Any suggestions?
Many thanks in advance,
Greg

Hello Andy,
Thank you for your help.
1. The drive just stopped working one day. I didn't do any upgrades, it just stopped working.
2. I don't remember the brand of the drive, or the enclosure. I could probaby find it in my records, but I bought them separate. From what I understand, the enclosure does have an Oxford chipset.
3. I have never updated the drivers/firmware. I saw there is an Oxford 922 update on VersionTracker.com, but I am not sure if I should try it. Should I?
One more development. I bought DiskWarrior in hopes of using it on the drive, but it doesn't see the FireWire hard drive at all. According to their text support, the partition is not showing, which is why the DiskWarrior can't see it. Does that many a difference in what I am dealing with here?
Thanks again,
Greg

All external Drives stopped mounting after repair disk permissions

My 2.3 GhzPPC G5 10.4.11 was running a bit slow so I ran repair disk permissions and now none of my external drives will mount, can't see them in disk utility either.
Drives work fine on my macbook pro.
I've searched for help but no luck..
Thanks for any advice...

Neil, you really should repair the disk before repairing permissions.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Tiger Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436

USB Drives Stopped Mounting

Does anyone know why my three USB drives have stopped mounting? Disk Utility can't see them either? One is a portable one that draws power from the bus, that is still drawing the power. Is it a permissions problem?

Mine is model HD-HB250U2, which has also been discontinued. I've fixed permissions twice, plus reset PRAM and NVRAM. Still can't mount the drive. It's ironic that this is the drive I'm using for Time Machine.
My next step was to install the 10.5.7 Combo update. I think I can do this, even though I'm at actually at 10.5.7, based on this article.
http://www.macfixit.com/article.php?story=20070824012114701
Can any advise if running the 10.5.7 Combo update is safe to do?

MyBook External Drive Stopped Mounting

I recently unplugged my external drive so I could move my laptop. I have done many times before without issue. When I plugged the firewire cable back into the computer, the drive did not mount. I rebooted, then rebooted pressing option + command + p + r, then I unlugged, took out the battery, held down the power for 10 seconds and rebooted. Nothing -- in system profiler, it says unrecognized device under firewire. This has happened before, but rebooting a few times usually solves the problem. Any ideas?

I spent about an our turning the drive off for five-ten minutes, then rebooting the drive and the computer. Eventually it just showed up again and appears to be working fine. I think this is an apple thing -- I have had the same thing happen with other drives. The computer just stops finding it. I suspect this is why they offer no support for use of external drives. Anyhow, thanks for the help.

External FireWire Drive Stopped Mounting

My OWC Mercury Elite 400GB external hard drive no longer mounts. Disk utility sees the drive by the factory default name (not the name i have given the drive). Attempts to repair in disk utility First aid yields a message of "Checking Non-journaled HFS Plus volume." "invalid key length volume check failed." "Error: Filesystem verify or repair failed."
Does anyone have any tips I can use to try to mount and recover the data. I am aware of Prosoft Data Rescue but would prefer to use that as a last resort.
Thanks in advance for advice

Do you have DiskWarrior? Or TechToolPro? Either one will check the Directory, which seems to have become corrupted.

How can I get an external (FW 800) hard drive to mount in OS X Lion

I have a FW 800 external drive connected to my iMac (24" Early 2008, 3.06 GHz, Core 2 Duo). This morning I unmounted it so I could unplug it from power and do some cleaning (canned air). When I plugged it back in and connected it again it does not remount. It doesn't show up in Finder or on the desktop. This is my Time Machine backup drive.
sgtbill

Try to mount it with Disk Utility. Usually, this works. Be careful to configure DU to show up all of possible drives first!

2 firewire hard drives stop mounting after attempting to install dvd burner

Hi....Im really at a loss here....I have 2 200gig firewire hard drives connected to my G4 tower which mounted and worked without a hitch until I tried to install a Lacie firewire dvd burner....now neither of the drives mount or even show up in dik utility on the tower or my powerbook....is there something I could do here?...lol...I dont even know where to start...and to top it off I couldnt get the burner to work on the tower or the powerbook....lol...my whole digital world is screwed right now....thx for reading my disaster story.

Ok this didnt work....I then tried these drives on a friends ibook (which mounted them b4) and same result...Does anybody know where I can get firmware or drivers? Or have a suggestion? anything would be good help thanks.
Jeff
The drives in question:
PM-350F2-M0S Glowie Firewire 3.5 External + Maxtor 200GB 7200RPM 8MB Hard Drive
ME720 3.5 Compact External Firewire + Maxtor DiamondMax Plus 9 200GB 7200RPM 8MB

Tiger randomly stopped allowing my External Hard drive to mount and...

Hello, I have been using an External Hard Drive (1 terabyte Seagate, new) for a couple months if not a year by now for saving movies, and all of my iTunes on it. Its been working wonderfully. However it recently stopped being able to mount citing invalid hard drive and gives me the options of either eject, ignore, or initialize. Im not sure what to do. And also my computer has been acting funny every since the day it started. I will walk you through it step by step.
July 6th I was surfing the web and unfortunetly clicked on a link that aparently contained a trojan. Or atleast thats what my Antivirus notified me of. I had downloaded the trojan some how without a pop up or anything telling me I was downloading anything. (using safari) So i ran a virus scan and saw one virus was in my system and that it couldnt be deleted or repaired by my antivirus program, Im working on getting rid of that but at the time I had my Seagate 1 terabyte external hard drive attached via fire wire to my Macbook. It was working then.
Later that day I unplugged my hard drive and took my laptop around a little bit, nothing unusual. Then when i came back later that night I tried plugging in my hard drive and a pop up stated that the hard drive was unable to mount and I could either eject, ignore, or initilize. I tried may different routes, restarting, letting it all rest, etc. And in Disk Utility i try to verify the disc and it says its unable to and needs repairs. So I try repairing the disc and it says unable to due to an error.
Then yesterday I went to my applications and noticed none of my applications are there anymore. These applications were saved on the internal hard drive so it was very odd to me. However i can still use spotlight to find and open my apps.
My question is, What can I do to allow my external hard drive to mount? I dont figure it is the trojan on my system but could it be? If so how would I fix it? Im mostly worried about getting the data off the external hard drive then I can reformat it. Or if theres a way to just get it back to normal without reformatting Id love to hear it. As for the applications missing and the trojan on my internal hard drive I can fix that, at the very least Ill just reboot my system with my original OS Disc and just start fresh, its about time anyways.
But please. If anyone has ever had their external hard drive just stop mounting and figured out what to do I would be ever so grateful to hear how you did so. The hard drive itself isnt damaged, its not making any unusual sounds. Whenever i plug it into the computer it acts like normal (turning on and what not) until the computer tells me it cannot mount then nothing happens. Ive looked online and it seems to be a software issue.
If its any help I was downloading a torrent (.avi, no viruses) at the time. I know sometimes if one file on the hard drive becomes corrupt the whole thing becomes unusable. Regardless I would appreciate it if anyone knows a way to at the very least retreive the files on the drive, but preferably know how to just get it back to normal. If i could get it to force mount (via terminal or something) I know which file would possibly be the corrupt one or something so I could work with it.

Bejan:
Thanks for posting back with the pics of the messages from your computer. Disk Utility reports "Underlying task reported failure" when repairing a volume is a directory error which cannot be repaired by Disk Utility. Unfortunately, Disk Warrior may not be able to replace the rebuilt directory, either. Tech Tool Pro has a better chance of repairing it, although this particular directory issue can be stubborn, and is often rooted in a hardware issue. Your surest bet is to backup/clone the information on the HDD using a utility like SuperDuper or Carbon Copy Cloner, completely reformat and erase the HDD (directions below), then restore data from backup.
Formatting, Partitioning Erasing an External HDD
• Connect external HDD to computer
• Turn on external HDD
• Start up computer and log in
• Go to Applications > Utilities > Disk Utility and launch DU.
• Select your HDD (manufacturer ID) in left side bar.
• Select Partition tab in main panel.
• Click on Options button
• Select Apple Partition Map (PPC Macs) or GUID Partition Table (Intel Macs)
• Click OK
• Select number of partitions in pull-down menu above Volume diagram.
For more partitions than one, after you have selected the number of partitions adjust the size of the partition by selecting the top partition and typing in the size; then move down if more adjustments need to be made.
(See Dr. Smoke’s FAQ Backup and Recovery for tips on partitioning external HDD)
• Type in name in Name field (usually Macintosh HD)
• Select Volume Format as Mac OS Extended (Journaled)
• Click Partition button at bottom of panel.
• Select Erase tab
• Select the sub-volume (indented) under Manufacturer ID
• Check to be sure your Volume Name and Volume Format are correct.
• Click Erase button
• Repeat above procedure to erase each partition
• Quit Disk Utility.
cornelius

After resuming from sleep, external drive stopped working, won't mount!

I put my mini to sleep, and have a 750GB SATA drive in an external enclosure that I had connected to it. The drive enclosure has it's own power which stayed on. When I clicked the power button on the mini to wake it up, I got a "device removal" error telling me the device was not put away properly. Since then I can't get my drive to mount. I've tried rebooting, disconnecting and reconnecting everything. It won't even show up in disk utility. I also have MacDrive on my PC, and tried connecting it via FireWire 800 and USB, and it won't show up on my PC either.
PLEASE HELP! I need this drive for work and I'm stuck until I can get it working again. Thanks!

No. Powering off and on again didn't work. My drive is a Seagate 750GB internal SATA drive in a Vantec NexStar-3 external enclosure. I don't think it is a driver issue. After the device removal error it won't mount on my PC or my Mac via FireWire or USB.
What I need to know is if there is some way to connect to the drive and make it mount with other software, using some kind of keystroke during startup, or maybe through terminal or something. I can't even try to repair the drive because it won't show up in disk utility.

EZ Quest Firewire 400 ext drive works in 10.4 (PPC) but won't mount in 10.6 (Intel)

I have an EZ Quest external FireWire 400 drive. Was working fine on my MDD Mac running OS X 10.4.11. NOW, when I hook it up to my iMac running OS X 10.6.8, it will not mount. Tried different ports. Tried device on and off at boot. Doesn't show up on desktop or in sidebar of finder window or in System Profiler. Drive powers up, but won't mount. Please help. Thanks. Dennis

I have the same problem. Two different EZQuest Quad interface drives suddenly won't mount on my 2010 iMac (Core Duo) via the firewire 800 or 400 ports. If I use a USB cable, both drives mount as normal, but I need the Firewire 800 ports to stream audio samples for Logic.
Both of these drives were working fine for over a year until I upgraded recently to 10.6.8 on the iMac and then tried to use one of the drives yesterday with a new 2012 MacBook Pro (10.7.4). The drive mounted once on the MacBook Pro, then disappeared and now will not mount on either the MacBook Pro or my iMac.
I tried resetting the PRAM and SMC on the iMac, but the drives still won't mount via firewire. The fact that both EZQuest drives still mount via USB indicates this is a firewire problem particular to Mac OS 10.6.8 and 10.7 rather than an external drive problem. It also seems that many people are experiencing this regardless of the external drive brand. Does anybody know how to fix this?

External hard drive stopped working, won't load

Hi There,
I have a LaCie external hard drive and I have tons of files on it. It all of a sudden stopped working. It is still getting power, but it won't connect with a computer. No warnings popup but it doesn't load. I've tried it with firewire and usb as well as on a powerbook g4 labtop and an iMac g4. Any suggestions on how to get to the files? Thanks

Welcome to Discussions - The power brick, even though it seems to be working, may be shot. Try using a brick from another drive and see if that will allow the drive to mount.

External Hard Drives not Mounting after Yosemite Upgrade

I've just upgraded to Yosemite, and none of my external (USB) hard drives are mounting (they don't even appear in Disk Utility).
Any ideas?

MacBook Pro 2009. 250 SD, HD 8Gb Ram.
I have had this issue for about a year...with no resolve!
Apple and the User community have not been able to solve issue.
I have had to work around it since the Oct 2013 Mavericks upgrade which “killed” (rendered unmountable) both my USB and Optical drives.
Hundreds of replies and remedies have not corrected my issue. Hundreds of replies stating that if there was a global issue it would of been fixed by Apple, not true. And dismissive replies stating that there must be a hardware issue are very discouraging.
So now, hoping to help the voiceless masses, I'm forced to share my experience.
As I stated, I have been having the issue since one of the Mavericks upgrades. The upgrade rendered externally attached drives unmountable...They are all seen in Disk Utility. They are just not mountable. Regardless of the flavor of the disk format, either Mac or PC, they are found, seen and refuse to mount. I can see them using Terminal commands, I can see them in System Report. I can reset all the memory I want...turn it off, reset, sleep, turn on, restart...NOPE...And the optical drive takes in disks but ejects them after an attempted mounting. Keep in mind, there are no physical issues with either USB or optical drives.
So now...I have had enough and need to correct the issue or buy a new equipment - starting to get into software development and need working equipment!!!
For the past month, I have been visiting the Apple store to assist in my issues...Back Story: I'm an IT Field Tech for the largest department store in the country and I have the good fortune of dropping in the Apple store anytime I want...The Geniuses booted the MB with a bootable image of Mavericks, and the USB and Optical drives WORKED fine...So, after I had stumped the Geniuses with my problems, we agreed that we would attempt to format and re-image the MacBook...Fine, do it, it's backed-up, how you ask? - Via my wireless My Book Live 3T drive, which only took 24 hours to backup, AKA Time Machine!
Great news! The re-image of Mavericks proved to work! I WAS able to mount external drives attached! How is that possible? Don't know, don't care! It just worked! So happy!
But wait! I then took the laptop home. Connected to my WiFi, to update Mavericks to the latest version...Good so far! Then it came time for a Time Machine restore, AKA Migration Assistance restore...So, I proceeded to migrate data back to my MB via wireless drive, good so far, booted in Migration Assistant, and I chose to restore everything except the network files, thinking that may be an issue...22 Hours later, the MB migrated without issue...all apps and personal files had migrated! YAY!
BUT NOW THE USB AND OPTICAL DRIVES FAILED TO MOUNT!!!
Great now what? I know, I will just re-image and start again...WAIT, I don't have a Mavericks Install Disk, no problem, I will just create a bootable USB drive with the Mavericks Install Image I downloaded onto my MB this month...NO YOU CANNOT, because you have no use of the USB drives!...And, Apple stopped making OS CDs back in 2009...Oh, and that wouldn't of done me any good, because the optical dive was unusable, anyway!
SO, back to the Apple store with my head hanging! At this point, Yosemite came out the previous Thursday, so no more Mavericks images, great! Perhaps the new OS will alleviate my nightmare!!!!...So, they re-imaged my Mac with Mavericks, drives worked again! SO, I took my MB home and attempted to download the new OS, Yosemite...which only took 2 days due to the amount of traffic on Apple's servers!...Anyway, Yosemite finally installed without out issue! Drives still worked! And so, I shutdown and restarted the system...No issues, USB and optical drives worked beautifully! Yay, Yosemite!...Fixed all my troubles!!!...Not so fast...
And so, I, again, attempted to do a Time Machine restore, via WiFi, this time it took 24 hours to restore...AND it worked! All apps and personal files transferred without issue, So happy! Put the laptop in Sleep and left it home and went to work! Came back from work, tested the system without issues. Rebooted...USB and Optical drive are NOT MOUNTABLE!
So now, what is the file that the restore keeps pushing to my MB that kills the USB and optical drives?
I would just stop restoring from a Time Machine backup, but the only way to get into the TM image is to use Migration Assistant. I cannot view the date in time of the image in TM's Star Wars time line. So, I'm forced to back up everything from the image in Migration Assistance. Not sure that it being an encrypted image has anything to do with it...
...Regardless, what is being “restored” to the MB that continues to configure the OS in such a way that makes all external drives unmountable...keep in mind, my external keyboard, hub and mouse are usable via USB.

External FW 400 G-Drive stopped mounting

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