My External HDD doesnt shown in disk utility or in finder

My External HDD doesnt shown in disk utility or in finder
tried everything possible checked everywhere this happened when i used disk utility to repair the HDD ?
please help

Do you have your Finder Preferences set to show external drives?
And, exactly what did you do with Disk Utility? If you repaired your internal hard drive, were you booted from the external?

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Hard Drive Upgrade - Incorrect Capacity Shown In Disk Utility After Installation

I have an older model Macbook Version 2.1 that had an 80GB hard drive installed. I have just installed a Western Digital Scorpio Black 500GB internal hard drive upgrade and successfully cloned my data over using Carbon Copy Cloner. The problem I have encountered is that only 98.1GB of capacity is shown in Disk Utility for the new hard drive. After starting the computer using my bootable copy via an external USB drive, I formatted the newly installed 500GB drive with the appropriate Apple formatting (e.g. GUID and Mac OS Extended Journaled) but it only shows 98.1GB of space available on the new drive. I was able to successfully clone the information from my bootable back-up of the old drive to the new drive but I just don't have the full 500GB capacity available to me.
What should I do? Is this a problem with the new hard drive or is there something I need to change on my Macbook to "see" the whole capacity of my new drive?
Thanks for your advice,
Dave

Hi Andrew,
When I formatted the new drive did it with 1 partition and it displays a TOTAL of 98.1GB free space (both in Disk Utility and About This Drive). As far as I can tell, the Macbook is treating the new WD drive as if it is only a 98.1GB drive rather than the 500GB drive that it is.
Thoughts?
Dave

TS1338 I have 4 Trojan Horse viruses on my external drive I use for Time Machine. My MacBook Pro hard drive is clean. I have eased the external drive 3 times using Disk Utility and it still has the 4 Trojan Horse viruses. How do I get rid of them. Wayne

I have 4 Trojan Horse viruses on my external drive I use for Time Machine. My MacBook Pro hard drive is clean. I have eased the external drive 3 times using Disk Utility and it still has the 4 Trojan Horse viruses. How do I get rid of them. I am using 10.8.3 Wayne

ksu62 wrote:
The infection names are: classload.jar-719ef6a5.zip
                                          classload.jar-5db452le31.zip
                                          ar3.jar-6ce3b2f-45l483f.zip
                                          classload.jar-lef99412-63bsd3fl.zip
Those look alot like file names and not infection names. I don't find any reference to anything like that on Norton or VirusTotal. Since you said these were Trojans, I would expect to see "Trojan" as part of the infection name.
".jar" files are executable Java applets. The random alpha-numerics would seem to indicate a cache file, likely from a browser with Java enabled. And we all know what ".zip" means.
Worst case is that you had Java enabled in a browser and were infected by one of the late variants of the Flashback Trojan over a year ago or one of a couple of other attacks using the same vulnerability but targetted against a small number of political sympathizers. Much more probable is that thes were Windows only Trojans. Hopefully you have a fully up-to-date OS X, including Java, and have disabled Java in all your browsers by now.

Disk Utility doesn't find any of my USB drives

A few weeks ago my just stopped showing any of my external drives when I plug them in. I can not see them in Disk Utility or in Finder. A while ago I had TUXERA NTFS installed and today I got those messages after plugging one of my USB drives. Is it possible that the problem comes from this program and should I delete it or what should I do in order to be able to work with my drives again?
Thank you

If you want a reliable and better NTFS driver, because you need to maintain NTFS to share the drive and use it with Windows, then I strongly suggest and use Paragon-Software NTFS for OS X (v. 11 at this point Im pretty sure, supports Mavericks).
You are not in MacBook Pro forum.

Disk Information Shown in Disk Utility

Hi MP Folks
My 2012 Mac Pro got 4 physical disks installed, 1 x SSD + 3 x HDD. All bays are used. As you know, clicking the blue Info button at the top of the Disk Utility window may bring your the basic facts and extra information about the disks listed in the left pane.
I thought the information given there should be same kind of data in the same format, but on my Mac Pro only the first 15 items are the same, the remaining information varies from disk to disk, as shown below for the disks from Bay 1 to 4.
As you can see above, after S.M.A.R.T Status, the items are different. I got a few questions here.
1. Why does the APPLE HDD HDS723020ALA640 in Bay 2 have no further information while all others have more reliability data collected?
2. Why does the WDC WD10EAVS-00D7B0 in Bay 4 have a different Partition Map Scheme: "Apple Partition Map" instead of "GUID Partition Table"? I did use the same way that I did on other disks to partition and initialise this 1TB disk.
3. In stead of assigning Disk Identifier in the order of drive bay, why does "Bay 2" have "disk3" and "Bay 4" have"disk1"?
Thank heaps in advance.
Regards,
B

Data are recorded on the disk surface with a semi-redundant error-correcting code. Hardware and firmware in the drive are used to accomplish correction, if possible. Small bursts of errors are often correctable, but sometimes it takes many, many re-tries to obtain correctable data. Failure to obtain correctable data after many re-tries produces an I/O Error.
I/O Error tells you the data pattern in a particular block you are trying to read is very difficult to read [most likely], or possibly was written wrong or partially over-written with other data if the power failed while writing [extremely unlikely]. This is most often caused by subtle changes to the magnetic regions that make up the physical data, causing a few bits to flip.
Getting an actual I/O Error is a desperate situation, much more extreme than the accumulation of minor data errors in the counter. There are data there, but they cannot be read. A drive with I/O Error has Bad Blocks, or may be failing completely. A drive with an accumulation of read errors means some blocks needed to be re-tried before correctable data were read.
The drive notes these problems, and maintains a "suspect list" of block numbers that are candidates for block substitution, and reports how many are on this list in its SMART status (accessible from Internally-mounted drives only). The drive is capable of substituting a spare block nearby, but cannot substitute another block unless and until new data are supplied, because doing so may poke a hole in the middle of a file.
Re-Writing the drive [traditionally with one pass of Zeroes] supplies that new data, and gives the drive an opportunity to check for proper data retention immediately after writing. Any blocks found not able to retain the new data have spares substituted, up to a maximum number of blocks in one pass (typically ten blocks).
Large scale studies performed by google in their servers indicate that drives that develop Bad Blocks in 24/7 use will typically need to be removed for too many Bad Blocks within 6 months.

New HDD not showing in disk utility

Help please!
i can up on a broken G5 i have replaced the HDD. now i am trying to install tiger. but the new internal HDD is not showing up in disk utility.
i plugged my passport in and it popped right up.
some one please let me know what you think.

Well, having a had hard drive connected may cause a grey screen (if the system cannot successfully perform a check of connected devices). Not sure about the fan.
If you have not done so yet, be sure to try resetting PRAM
http://support.apple.com/kb/HT1379
If that does not help, you can also try resetting the SMU (power management).
http://support.apple.com/kb/HT1767
Follow the procedure precisely.
It is also possible that the old drive was not bad and your iMac has some other problem. Did you ever test the previous drive on another Mac (or connected externally) to confirm it was faulty? That +other problem+ may be what you are experiencing now.
Also, I asked this previously but, are you able to start up the iMac using the optical drive, with a Mac OS X installation disc in there?

Disk utility can't find HDD

Hello,
I was playing music on my macbook 13" early 2011 and all of a sudden it stopped playing. After I logged in to my account on my mac the screen froze so I decided to do a reboot. After I tried to restart all I got as a folder with a question mark in it. I did my research and did many attempts on fixing it but disk utility just couln't find my macintosh HD. After reading lots about this problem on the web I installed a new (empty) HDD but still disk utitlity wasn't able to find it so I could not install OSX.
Can anybody help me, is it the HDD or something else and how can I solve this problem?
Thanks in advance!
Victor Verdonschot

Hello,
I put the original HDD in an external case. Tried to boot from there and as it seems it works fine. But it still can't find the internal HDD.
Any help?
Thanks in advance.
Victor Verdonschot

FRUSTRATED! Cannot access Seagate external HDD - message is "the disk you inserted was not readable by this computer"

I get the message "the disk you inserted was not readable by this computer" when trying to access my Seagate external HDD.
Disk Utility lists both the Seagate drive and volume but all options (verify disk, repair disk) are greyed out.
It says the volume is unmounted and Windows_FAT_32.
(The external HDD used to be formatted for NTFS, but when I moved across to Apple last year, I reformatted to FAT32).
I haven't accessed the drive for a few months but the last time I did, it worked fine.
I'm running OS X 10.9.5 on MBA bought last year.
I've spent 2 hours trawling through blogs/mac forums/apple support and nearly bought Disk Warrior out of frustration, but surely there must be a simpler solution?
I don't think I'm dealing with a corrupt drive, just an inaccessible one!
Any help greatly appreciated, even if it is to pay the $$$ for DW...!
Thanks, Jay

See mount section in 1st link.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

Unable to find HDD after erase with disk utility

Background id I had installed the Lion OS but then got into trouble with the "flashing question mark " at start up.
After using the recovery option, Lion OS was reinstalled and things were fine for a couple of days. Then the "flashing ?" returned
This time, it appeared the "Cmd R" did not work. So I browsed until I found out it is possible in the reinstallation, the recovery option was removed.
Ok, so then one of the discussion threads suggested to use the installer disc to boot up, use the disk utility to erase the HDD and install in my case Snow Leopard, and thereafter install the Lion OS.
I am stuck after clicking "erase". First there was an error message - "file system formatter failed' then I no longer can see the HDD in the disk utility.
How can complete the HDD erase function so I can proceed to install the OS?

A check in the system profiler - "There was an error while scanning for Serial ATA devices"
Looks like my iMac's HDD is kaput...Or is there a way to fix this?

Iomega external HD no longer mounting, disk utility fails to resolve issue.

I have an Iomega external HD (1TB) that's been working faithfully for two years as my time machine backup. I have Mac OS X 10.6.8. This morning, the HD was no longer showing up on my desktop. I have tried to mount the HD through disk utility and it states it is unable to mount the drive. A screenshot of what I see on disk utility is below. The drive still lights up, sounds like it is running and the drive is active. I have also done the following:
1. verfied drive; states it needs repairs. When repairs attempted, utility goes on, and on, and on with no progress and I have to force quit.
2. Have reset the PRAM and nothing changes.
3. Have started mac in safe mode, still not recognized and same error messages given in disk utility.
4. Other external HD works fine on mac, have not had any software changes/updates since yesterday that I know of that would affect anything.
5. USB and Firewire ports all functioning correctly and the drive is recognized on those under system profiler.
5. I have attached the problem HD to my Windows XP laptop (an old one but still works) and the drive is recognized under device manager but does not show on the desktop (formatted for mac though, so not too surprising).
Would appreciate anyone's advice on this one, have hit a wall.

Turn off Time Machine, select the 1TB ST310005 Media Drive instead of the Time Machine partition and see if it will Repair.
If that doesn't work, you might Erase / Repair / Format and start over providing that there is nothing critical on the Time Machine backup that you can't live without.

Restoring .dmg image from external to Mac HD in Disk Utility: "Unable to scan image (Input/output error)"

Hi guys,
So I've got a problem with restoring the image backup I did (using Disk Utility) of my 500GB HD on my MBP which was acting weird or maybe even crashed a few months ago. After creating the backup image and putting it on my external device, I installed Mavericks back to see if everything was alright (mainly the HD) and everything seems okay.
I did try restoring the backup image through disk utility before installing mavericks (thus erasing everything again on the HD) AND after. But nothing..
The whole process starts fine and then it starts scanning the image when after maybe a good 10-15min in I get a message that says that it was unable to scan the image. I tried verifying the disk(s), everything came out "OK". Also tried scanning it through Images > Scan image for Restore... with the same results.
While searching I've seen people getting messages like "Unable to scan filename.dmg (Invalid argument)" and "Unable to scan filename.dmg
(Internal error)" but none have (Input/output error)
The screen grab is below.
I also came across something about using terminal/commands but I'm not that savvy with it, especially considering that those there had issues with either mounting or trouble finding the image.
I've also tried moving the backup image to a different external device 2TB and also the desktop because I read it may have to do with the format of the externals or maybe free space. But THEN I would get a message saying
"The Finder can't complete the operation because some data in "Mac HD Backup.dmg" can't be read or written. Error code -36"
Fyi ALL my externals are HFS+/Journaled and the backup image format was compressed.
I REALLY don't know what to do next. Was it the wrong move to create a dmg image? Have I lost everything? Is there still a way out?
If anyone can help, THANKS!
2012 MacBook Pro, Mac OS X (10.9.3)

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.

External Hard Drive showing in Disk Utility - but not desktop.

A little background:
Yesterday, I moved my shelf where I have my modem, Airport Extreme, Airport Express and an external HD connected to the extreme to be a wireless HD for all users to access. Everything worked great - no problems whatsoever.
Problem: I have reconnected everything exactly as it was and reconfigured it as it was and now the external HD is having issues. When connected to the extreme, I can see it in the airport utility, but cannot gain access to it in that way. When I connect directly to my macbook, it is recognized by the disk utility, but does not appear on the desktop.
I don't know if this may have caused the problem, but I carelessly, unplugged the power bar for which all the above mentioned hardware plugs into when moving the shelf. Now, everything works as it did, except I can't get the express to show up once it is configured (but this isn't surprising as I had to fight with it the first time I configured it - not uncommon I am told), and the HD is no longer accessible via the network, or when directly connected to my macbook.
Help! According to the utilities, the data is still on the disk, I just can't access it in any way.

From the Disk Utility, select the drive and click on the Repair Disk(not Repair Permissions) button. If the Disk Utility finds a problem it can't fix, DiskWarrior or TechTool Pro will likely succeed.
(24355)

External hard drive seen in Disk Utility, but will not mount.

My external hard drive has power and is spinning, but will not mount. It was fine yesterday. It shows up in Disk Utility and is verified and repaired. Tried the drive on 2 other macs with same result. Tried a new enclosure and that did not work. Tried all ports...usb and firewire. Any way to save my data?
I have screen shot of the partition info from Disk Utility for the hard drive included:

Hi Dominic,
If this is still not mounting, it may be worth trying a PRAM reset...
http://support.apple.com/kb/ht1379
Ben

Non-formatted External Harddrive not showing in Disk Utility

I have an empty external hard drive that is not formatted. I would like to format this and use for storage of some of my larger files. However, it doesn't show up in Disk Utility, or also doesn't show up when checking off "Show External Drives" in finder preferences. If I have it plugged in to the mac during start up, I only get a grey screen, the mac will not start. I've tried this on my 2010 Macbook Pro and 2012 Macbook Pro, same results. I have to unplug it for the computers to start. Both are running OSx Yosimite. Any suggestions of programs that will format this

Sounds like a broken ext HD. Replace it.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.2), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

OK to repartition external drive w/data using Disk Utility (split in two)?

My Time Machine backup folder on my 500GB external drive just kept growing and growing, nearly filling the drive (which I use for other things). I read that one way to limit Time Machine's appetite is to point it to a partition that is only so big. (Apple: There should be a setttig for this in Control Panel.)
So, I've made 150GB of space on the external drive by deleting the old Time Machine backup folder (this is just for a few minutes, what are the odds the my MBP drive will die? I would like to create a new partition on the drive of, say, 125GB (for the the 100GB drive in my MBP). Then point Time Machine at it...
But I'm a little nervous to do this, since partitioning drives has historically led to significant pain and suffering. I've read that Disk Utility can repartition external drives, with data on them, safely. Is this true? Anyone have experience in this? Thanks.
...Rene

Rene,
No, you cannot dynamically re-partition that one, without first destroying all the data on it by making an initial partition of the entire drive (actually, a new partition map will often be written with a simple format of the drive, but that still destroys all data). In fact, the "Master Boot Record" (MBR) is a Windows thing, and prevents a few Mac functions.
Scott

My External HDD doesnt shown in disk utility or in finder

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