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Questions tagged [hard-drive]

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

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What does “DOE compliant” mean in Disk Utility?

When erasing a drive with Disk Utility, you have a couple options. An insecure wipe, a single pass of zeroes, a "DOE-compliant" 3 pass, and a DOD (Department of Defense) 7 pass. DOE doesn't stand ...
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Tracking down frequent (every 20 seconds) SCSI hard disk drive access in 10.7

In a Lion Server (10.7.3 and 10.7.4 tried) system with multiple drives attached to an HPT SATA controller, there is some process that keeps accessing the hard disk drives exactly every 20 seconds. As ...
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Is there a HDD/Hard-Drive testing tool for mac?

I just found an external HDD in my shelf and want to sell it :-) Before this, I tried to delete all the files on the HDD, but the disk utility of Snow Leopard aborted with a known error "Disk Erase ...
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DIY Fusion drive with 3 drives

Is it possible to build a DIY Fusion drive using 3 drives - 2 HD's and 1 SSD? Will the Fusion machinery optimise on three levels i.e. SSD, then fast HD, then slow HD? I have a mid 2011 27" iMac, ...
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4answers
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Disk structure error reported in Onyx but not fixable via the Disk Utility in Recovery Mode

On Yosemite 10.10 Onyx returns the following error: Error: -69845: File system verify or repair failed Underlying error: 8: POSIX reports: Exec format error The disk needs to be repaired. I ...
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How to empty MobileBackups.trash content

I noticed that OSX reports a wrong disk space amount, reporting that "Other" space is near to 170Gb. Digging into the issue here "Huge inconsistency in disk space measurement, missing 50% of the disk"...
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How do I transfer a file from a guest account on a MacBook Air?

I'm logged into the guest account of a borrowed MacBook Air which is running OS X Version 10.9.2 and I've been trying to transfer a 2.19GB video file to an admin account, a USB or external hard drive, ...
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How can I let Windows XP read Mac OS Extended (Journaled) drives?

How can I let another PC using Windows XP (Service Pack3) read Mac OS Extended (Journaled) volumes? Windows XP shows nothing.
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1answer
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In Disk Utility, what advantages do “read/write disk image”s have over “sparse bundle disk image”s?

If I want a read/write disk image, then aren't sparse bundle disk images always the way to go? They start at 0 kb in size, and grow to accommodate whatever you add to them, and if you delete stuff, ...
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Do 2.5" SATA HDDs in an external enclosure need extra power over USB with Windows?

MacBook Pro 2008 motherboard failed. Upon sending it to an Apple authorized repair center, they confirmed this. They gave me the laptop back so I could open 'er up and get the hard disk out, which I ...
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How can I prevent external hard disk from sleeping when connected to Airport Extreme?

I have a 1TB external hard disk from Seagate connected to the USB port of my Airport Extreme and everytime I need to access it I have to wait some time until it leaves the sleep mode. Is there a way ...
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How can I get my 3rd party SSD to boot El Capitan?

I have a Mid 2012 13 inch MacBook Pro that's been running successfully with a hybrid drive (3rd party) for the last few years. Recently, the operating system crashed and the hard drive is no longer ...
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2answers
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Mount external HDD readOnly option

I have the following problem: I used the optical bay to use a HDD in my mid 2010 13" Macbook Pro in addition to my SSD. It was working just fine until a few days ago, when it started to get "slower". ...
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Disk space disappears to 0, then after a while I have free space

I've been having this problem for quite a while and it happens occasionally and when it does it get very frustrating and I'm just trying to pin point what is causing it. When it happens, the disk ...
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Space Occupied By Other Files And Folders On Hard Drive

I have been using VirtualBox to create a virtual machine to run Windows 8 on and after deleting the virtual drives and virtualbox due to having issues with Windows 8, I am missing a lot of memory from ...
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Issues with installing SSD instead of DVD drive?

It is common to replace a MacBook Pro's hard disk drive (HDD) with an solid state drive (SSD), however, that may pose a threat to the HDD if installed in the optical bay instead of the SuperDrive.* ...
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1answer
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How to isolate the most disk-active process(es) in OS X?

I have some process(es) performing a lot of drive access from time to time, however I've hitherto been unable to isolate which process or processes are performing the access. What shell command can I ...
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1answer
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What's the easiest way to free up disk space on my iMac with a huge photo library?

This is a hybrid hardware/software question with a few more factors than the typical "freeing disk space" question. I have an older iMac with (I think) about a 250 GB hard drive. It's been running ...
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1answer
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Can I convert a RAID 0 set to a RAID 5 set?

Can I convert a RAID 0 set to a RAID 5 set in a Mac Pro? I currently have two 500GB drives in a RAID 0 set. I want to add a third drive and convert it to a RAID 5 set. Is it possible to do this ...
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Partition problem with APFS containers in macOS High Sierra

As always I'm so impatient and migrating with my main devices to the first developer previews the day they are available. Which as always bring me only problems but I just cannot help myself. So ...
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1answer
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Timemachine - Turn off “No Backup for X Days” for secondary Disk

On my MacBook Air I use TimeMachine with two USB-Disks. (Latest El Capitan) My primary disk is located at my house, the secondary at my parent's house. As I am not always at my parents, this "No ...
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Fan speed increased after upgrading to SSD

I just replaced my Macbook Pro's Mid 2012 HDD with a Samsung 850 EVO SSD. The performance is great and I am very happy, but I noticed that the fan seems to run faster. It is not a drastic change, but ...
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How do I spin down a secondary disk when not mounted?

I have Macbook Pro 13" (Early 2011). I replaced the SuperDrive with a SSD that now is my main disk. The existing HDD is used for Time Machine and nothing else. I have 2 problems with the secondary ...
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1answer
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Customize the Boot Camp Drive Icon in Lion

A while ago, I remember having customized the Boot Camp drive icon with a pretty simple hack. It was on Mac OS X Tiger. And it was that hack. Now I'm running Lion. Windows 7 is comfy on his Boot ...
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External USB hub for 4 external hard drives

I have a macbook pro. And like all macs, there is never enough ports. I've been searching and searching to find a USB hub that power 3 external USB hard drives. Any advice?
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Change APFS Volume to case sensitive

I have a macbook pro with 1TB internal glued flash drive, of which around 600GB are full. I would like to change the volume format from APFS (case insensitive, encrypted) to APFS (case sensitive, ...
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1answer
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Why won't Migration Assistant recognize my old Time Machine backup?

When I attempt to run Migration Assistant, it searches and searches but can't find the backups. When I open Finder, I can clearly see the backups and navigate around in the backups for the different ...
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1answer
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Can I Mount a Hard Drive in Mac Pro Tower as Read Only?

I'm trying to recover data from a failed external Fantom RAID Drive enclosure by plugging the drives into a Mac Pro tower, but I'm concerned that OS X might write to the disks and jeopardize the RAID ...
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2answers
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New hard drive in Mac Book Pro leading to occasional crashes and kernel panics

Ok, this is kind of a long story because I don't know what facts are relevant. I fell off my bike and my 2010 13" MacBook Pro receives blunt trauma. It's in a protective sleeve so I don't think ...
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How to allow an internal disk to sleep on 10.13

I have an internal disk which is noisy and seldom used. With previous versions of OSX I was able to spin it down by using diskutil eject, but with the latest High Sierra 10.13.4, after a few seconds ...
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430 views

External Hard drives not available after sleep

Not finding this question answered anywhere: Recently upgraded to OS10.12 on my iMac. I have 2 LaCie external hard drives attached via USB. As long as the hard drives are awake (spinning, blue light ...
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Folder with nothing in it is still using up space

I have a folder with absolutely nothing in it. Zero. I made sure there was no hidden files in it, by typing "defaults write com.apple.finder AppleShowAllFiles YES." into my terminal. There is ...
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Disable USB Write Caching by default

Is it possible to change OS X's USB filesystem mount behaviour to use the noasync flag to disable write caching? The aim here is to allow USB devices to be safely removed without eject or hdiutil ...
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0answers
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Time Machine and case-sensitive HFS

Time Machine defaults to formatting a new drive to Journaled HFS+ (case-sensitive), if you set up the drive from within Time Machine itself. However, my main drive (the one Time Machine will be ...
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2answers
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How can I reformat my hard-drive?

I am in Disk Utility under the Erase Tab. The Format section is grayed out even though I have my main disk selected. The only buttons active are Erase Free Space, but I want to reformat the entire ...
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2answers
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disk full - Mac OS won't boot

My friend has a problem getting Snow Leopard to run because the disk is completely full. I suggested getting into command line mode (CMD+S on boot) and delete some things, but it didn't work (nothing ...
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4answers
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MacBook Air: What taking up all my hard drive space [duplicate]

I have a 128gb MacBook Air running Lion. I am constantly having issues with disc space, but have no idea what is consuming it all. When I look at the disc utility break down, it says about 80% of the ...
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3answers
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Clean install of Yosemite problem

Hopefully someone can help me. I've tried so many options. I purchased a used MacBook Pro, late 2011 model. The person I purchased it from said he wiped the hard drive, but when I got home, it seems ...
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3answers
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How many writes do I have on my 250GB SSD hard drive on my Macbook Pro High Sierra [duplicate]

I would like to know how many writes I have on my Mac's SSD hard drive? I would also like to know if there is a terminal command I can run to find out this information and how many writes I have left ...
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3answers
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Enable writing to NTFS harddrive with non-standard name on Mac

I have a lot of NTFS hard drives back when I used a Windows PC. I'm trying to write to these drives with my Macbook Pro on OSX Yosemite 10.10.2. I'm going through this tutorial. I have to write this ...
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1answer
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dd ruined my USB stick, how do I recover?

I tried to copy a Linux distro over to my USB using DD. But half way through it failed because the computer went to sleep or something. I plugged the USB in and I get a message saying it's unreadable ...
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2answers
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External hard drive not indexed by Spolight on Mac OS X Mountain Lion

I recently bought a new hard drive and it is not indexed by Finder. I tried to get it re-indexed by following this tutorial: http://reviews.cnet.com/8301-13727_7-10330114-263.html and I even tried ...
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2answers
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Restoring a Time Machine backup to a machine with a password on the drive

I've inherited an older Retina Macbook Pro from a deceased relative. I don't know the password for their user account, and I would like to make the machine usable. I have a Time Machine backup from ...
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2answers
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Access VirtualBox shared folders in Yosemite

tl;dr: How to access folder shared in host system from within Yosemite run in VirtualBox (guest)? I have added a shared folder in my VirtualBox (went to virtual machine's settings, then to Shared ...
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1answer
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I just overwrote my folder while mounting a hard disk drive. How do I undo/recover it?

I was trying to mount a Linux filesystem on a Mac and accidentally mounted it to my ~/Documents folder using a utility ext4fuse. Below command is the issued command: sudo ext4fuse /dev/disk2s7 ~/...
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1answer
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External Seagate Hard drive for Mac - Compatibility

I am looking to purchase a Seagate External Hard Drive for my MacBook Air. The products claims it works only with PC (windows), however, I have read multiple places that I can just format the drive ...
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4answers
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Why does RAID 1 “Mirroring not provide performance improvements”?

I have always used Software RAIDs, either Apple-provided, or via SoftRAID, etc. I am about to re-zhuzh my arrays and decided to do a little research beforehand… and On Apple's site, there is a ...
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3answers
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50GB of disk space missing

On a 120GB SSD hard drive in a MacBook only 70GB are available. The missing 50GB are not even shown as free space. Here is what the output of Disk Utility looks like: As you can see on the first ...
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2answers
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Locate long file paths on external drive with terminal

I need to move a large volume to a new raid server that's PC formatted. However I have a couple paths and filenames that are interrupting this process. I would just like to know how to use the ...
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3answers
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Backup/Time Machine solution for an office full of iMacs?

EDIT: For anyone coming across this question, the best solution I've found is a cloud backup company called Backblaze — it's in the cloud, so no longer have to worry about hardware failures and we now ...