A hard drive is a device for permanent or long-term storage in computers.

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problems with computer itself due to improper disconnection of disk?

I know if a disk is not ejected properly, that can cause corruption or data loss on that disk. But can it cause problems with the Mac as well, such as with the file directory? And if it did cause ...
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10 views

Mac keeps booting into disk utilities

my mac kept getting stuck on the apple logo when booting up so I went into recovery mode and formatted the disk and installed OS X again. But for some reason it is not booting normally when I switch ...
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1answer
14 views

New uninitialised SSD not showing in Disk Utility

I have bought a new Samsung EVO 850 SSD, it is yet unformatted. I have a SATAI/II to USB3.0 dock which I want to use to get the drive formatted, but it is just not showing up in Disk Utility (Recovery ...
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7 views

Cannot resize Macintosh HD using (supposedly) available free space

I partitioned my hard drive in order to install Ubuntu, but I now would like to reclaim that space and add it back to my Macintosh HD. I managed to delete the Linux Filesystem and Swap, and Disk ...
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How do I maintain/extend the user access control from my internal hdd on an external hdd?

I attached an external Firewire HDD do my iMac and want to maintain or extend the user accounts and group structure that I have setup on my internal HDD to my external HDD. How do I go about that? Is ...
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9 views

Can not boot anyway to restore files

I can not get my Mac Book Pro to boot. It will only boot in Recovery mode. I am assuming I need to reinstall the OS but anyway to save files? What if I connect the hard drive to an enclosure and ...
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20 views

Cannot Enable Jounraling (OSX Lion 10.7.5)

so I am trying to enable journaling on my main disk. I booted up from a thumb drive with OSX installed on it and opened disk utility, and the button enable journaling is greyed out and unclickable. It ...
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1answer
11 views

“Startup disk” in “About this Mac”

I noticed that on when I go into "About this Mac" on my iMac I see a parameter named "Startup disk" while on my MacBook I do not... Is this because I have multiple disks in my iMac and only one in the ...
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48 views

After update OS X EI Capitan, external hard disk format changed

I always use the same external hard disk on my Mac formatted as OS X Extended (Journaled). After upgrading my OS, it's recognized as NTFS volume now. What should I do?
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41 views

Hard Drive not showing up in Disk Utility

So I arrived home from school today and wanted to use my iMac, but somehow it wouldn't react. I pressed the power button until it shut down (or crashed...) and rebooted it. After rebooting everything ...
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21 views

External Hard Drive Not Showing Up after dragging it to Terminal?

So from the left side of the Finder I accidentally dragged my external hard drive and now it doesn't appear there. I would like to see it there, I know it's reading it because I did an ls /Volumes and ...
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34 views

Why does my external harddrive not work when attached to this USB3 Hub?

I own a Macbook Pro 15" Mid 2015 which supports USB 3.0 and bought a Western Digital 2TB external USB3 harddrive and a USB 3.0 Hub from Anker with external power supply. When I plug-in the harddrive ...
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87 views
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Sometimes Mac doesn't recognise my external hard drive

I have a Western Digital My Passport Ultra 1 TB external hard drive that is formatted FAT32 and a 16 GB Silicon Power USB thumb drive and both of them uses USB3 but my MacBook Pro sometimes doesn't ...
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1answer
25 views

Can't log into my MacPro user account

I have an older Mac Pro in 10.11. After a minor update, I can no longer log into my main user account (which is a standard account) with all my files; the rotator goes indefinitely. I can log into any ...
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2answers
37 views

Swapping HDD RAID 1 with SSD in Mac Mini

I have a Mid 2011 Mac mini with 2x 500G HDD configured as RAID 1. Recently one of the HDD died. I planned to replace the dead HDD with a 500G SSD, and let the RAID 1 rebuild Is this a viable ...
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60 views

“Operation can't be completed because item with name already exists” error with Paragon NTFS

I reinstalled Mac OS X El Capitan 10.11.5 on my 2013 MacBook Pro, today, and I've been having an issue copying files from my NTFS formatted external drive using Paragon NTFS. This issue was not ...
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22 views

Should I have my Mac on until “external” hard drive encryption process is done?

I have a MBP 2012 and replaced the internal hard drive with an SSD and the SuperDrive with a 1TB HDD. I'm encrypting my 1TB HDD. Should I leave my Mac on until it's done? Does OS X pause the ...
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1answer
46 views

Screwed up my 1TB HD iMac27 - I am running OSX 10.11.5 need to rebuild it in Terminal

** Not sure what I did but I need to regain the space on my 1TB HD. I have made a full back up and need to know the step by step commands in TERMINAL to do this. As you can see I have access to only ...
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1answer
30 views

Time Machine External Hard Drive stopped being recognized

So I got a 2015 rMBP last year and also got a WD MyPassport External Hard drive with it for Time Machine backups. It ran perfectly a few times a week until yesterday when I plugged it into my Mac. It ...
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1answer
41 views

Hard Disk problems, unsure of how to proceed

A couple of days ago, I closed the lid on my 2012 MBP running El Capitan with Samsung Pro 830; it had nearly no power left. Power ran out while I was closing the lid, I suspect, so I plugged it in, ...
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1answer
48 views

How to repair HFS+ partition?

So somehow my 2013 Retina MacBook Pro's internal SSD went and got its partition map messed up. I was using it, put it to sleep, and when I woke it back up about an hour later I was presented with a ...
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30 views

Resizing sparsebundle in Disk Utility

I want to resize (shrink) the capacity of the backup.sparsebundle to approx. the size actually taken up the files. What I did thus far I already compacted the image: # hdiutil compact backup....
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1answer
43 views

How can I safely create a partition to an already bootable drive

I already asked this question on Apple's community forum, right here, so I'll post the answer here if something comes up there first. This is my problem : I recently bought an external drive of ...
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33 views

How to distinguish a filesystem corruption from a hard drive failure

If I understand correctly when Disk Utility starts throwing errors during a disk verification there are three possible outcomes: some errors can be fixed on the spot via the repair disk ...
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25 views

Can't delete a partition on my HDD

I have created a new partition to install a new OS. Now, I would like to delete the old partition on my hard drive. Delete button is inactive. Screenshots: What I'm doing wrong?
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1answer
33 views

Where is my missing drive space?

I have a 2012 Mac mini running the latest Yosemite that I use as a server for file sharing, FileMaker, calibre, Time Machine and Plex. The Finder reports that the internal drive has a capacity of 499....
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34 views

How to format a partition for bootcamp without to partitioning all drive?

I'm trying to install a Windows 10 in my MacBook Pro 2012 with El Capitan. I am now in the step that Bootcamp will create a volume for Windows installation. My MacBook got two internal (physical) disk ...
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13 views

Mac Stopped detecting external hard disk

I have 4TB Seagate HDD, it was working fine till this morning on my mac(Yosemite), but when I plugged it in today.. it shows "The disk you inserted was not readable by this computer." HDD gets ...
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31 views

Using disk makes things slow on El Captain

If I run following alias in my $HOME directory: biggest_files='find 2>/dev/null . -type f -ls | sed -e "s/[[:blank:]][[:blank:]]*/ /g" | cut -d" " -f 7,11- | sort -nr | head -25 | awk "{ printf \"%...
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55 views

iMac 5k internal SSD vs external SSD performance

Can anyone point me in the direction of a real-world performance comparison between a iMac 5k's internal SSD and an external one (ideally one on thunderbolt and one on usb)? Basically, I want to know ...
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1answer
69 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K) - 100% Disk Space used

my I'Mac 5k won't boot. What happened: I did some image editing in photoshop and instead I resized the image to 1100px i typed 11000px. After this mistake i got the rainbow circle of death. I tried ...
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57 views

El Capitan can´t see or remove partition but it shows up in Terminal

EDIT: managed to reformat the partition to JHFS+, after accidentaly creating another partition i merged the new and the old one i dint want, then it let me merge all of them together. I created a ...
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39 views

Accessing files on external drive through USB

I am using a MacBook Pro Late 2011. I lately took out the hard drive and replaced it with a new one. The old HDD still has OS X installed on it, so basically I did nothing before taking it out. Now I ...
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Missing folder and it's contents on external hard drive. Permissions issues too

I did a deep search to see if I could find an answer. I had posted this incorrectly in the wrong place but then found this group. And I hope some genius can help me. I've had a Toshiba drive that ...
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1answer
57 views

Hard drive full with 200GB of used space that I can't find

All of a sudden I've run out of space. On my 250GB hard drive, 236GB is used up with only 13GB free. I used Finder to find big files. Nothing significant. I used tools like Disk Inventory X, ...
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1answer
33 views

HDD corruption after power cutoff

Yesterday a breaker tripped in the same room as my Mac Pro 1,1 running Yosemite (Hacked boot.efi.) All other machines powered up but this one. Attempting to mount via Target Disk Mode timed out, so I ...
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1answer
44 views

BootCamp partition error even though my drive is one partition

I am attempting to install Windows 8.1 on my machine (a mid 2014 MacBook Pro running El Capitan) and I keep running into a BootCamp error in the first step that says The startup disk must be ...
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1answer
50 views

Drive unmountable FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF issue

I have the standard single drive inside my MBP. The issue is inside my external usb drive. The HDD had 4 (visible) partitions: My Passport (Core Storage volume) 959 gb SSD (backup for my mbp) 339 ...
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1answer
44 views

Bootcamp - Lost 200GB as Bootcamp froze on “while partitioned” for 5~ hours

I was installing Windows 10 via Bootcamp on my iMac (27-inch, Late 2013) running OS X El Capitan - Version 10.11.4. What happen was yesterday Bootcamp froze on "while partitioned" for around 5 hours....
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1answer
24 views

Can I use Time Machine for multiple different backups?

I have my Macintosh HD 500 Gb who backs up on two external hard drives (both 500 GB), so i have always two backups! But i have an other external hard drive (1TB) with a lot of footage on it which i ...
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1answer
55 views

Unable to erase, reformat, or repartition USB drive

This afternoon I attempted to mount a .iso of Windows 7 to a bootable USB drive. It's about 370GiB, so more than enough to store it. I did the following to get myself into this mess. Note,/sda/disk2 ...
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1answer
73 views

First Aid Fails on External Disk, what can I do from here?

History: Running an iMac late 2011 and updated the OS to Yosemite when the computer stopped booting. I have a history of killing HDD so I figured it was a bad HDD and I went to change the drive. ...
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3answers
258 views

Is this external USB3 drive really this slow for my Macbook TimeMachine backup?

I got myself this WD 2TB USB3 external harddrive for backups: http://amzn.to/1X8b3a8 I connected it to the USB 3.0 port of my mid 2015 Macbook Pro 15". When I run Time Machine, it really takes ...
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24 views

Can't access External Drive (time machine), no EFI partition system. How to manually rewrite it?

tried to back up my Mac to time machine yesterday but I couldn't mount the drive. I have a Lacie 3TD hdd that is partition into msdos(for transfer between pc and mac) and hfs(time machine). I am able ...
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1answer
120 views

Moving Time Machine backup between two local disks results in full backup instead of incremental

The Problem After migrating the entirety of a a Backups.backupdb to a new hard drive as recommended by Apple by simply copy-pasting within Finder between two local disks, Time Machine encountered ...
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1answer
86 views

Partition type suddenly FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, drive unmountable

I have two drives inside my MBP, an SSD for the OS and the original HDD for large Data. The HDD has 3 Partitions: My Data (Core Storage volume) 20Gb for Linux 4Gb for Linux Swap Recently I ran ...
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2answers
80 views

iMac 27" late 2012 SSD upgrade

I'm the proud owner of an 27-inch iMac 2012 with high-end configuration, but the 1TB fusion drive keeps being the bottleneck. As my warranty has expired now, I want to upgrade the 128GB SSD to a ...
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1answer
46 views

Missing disk space after failed Bootcamp install

Earlier today, while running Bootcamp attempting to install Windows 7 on my late-2012 iMac, I suddenly lost 160g of disk space after Bootcamp failed to create the partition for Windows. Disk Utility ...
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1answer
59 views

Can naming/running a program “sudo” somehow cause problems?

I hope this is an appropriate place to post this--I have no idea what happened. I named a c++ file (a simple sudoku solver) "sudo.cpp" and then compiled it with "g++ sudo.cpp -o sudo" and ran "./sudo"...
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How to exercise a new hard drive by erasing multiple times with Disk Utility app?

In El Capitan, in the Disk Utility app, I cannot find the option to rewrite bogus data (zeros or ones) across the entire drive multiple times. I am using a spinning rust platter disk, not an SSD. ...