Questions tagged [hard-drive]

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

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5
votes
4answers
60k views

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 ...
4
votes
3answers
3k views

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 ...
12
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2answers
5k views

How do I not accidentally eject external drives?

I have a Mac Mini with a few external drives connected that I use as a home server. Normally the Eject buttons next to the drive icon are really handy as they let me eject an external drive very ...
9
votes
2answers
799 views

How can I move my data to the new harddrive?

So I am planning to upgrade my Macbook pro's harddrive to a SSD. I don't know much Mac OS X tools, so I was wondering if anyone could let me know how I can copy my entire harddrive (including OS) to ...
14
votes
3answers
10k views

How can I disable the 2nd hard drive in my 27" iMac?

I have an 2010 27" iMac with an SSD and a regular hard drive. Now that I've been using the machine for some time and have not come close to filling the SSD, I'd like to disable the spinning hard drive ...
4
votes
4answers
7k views

My WD external drive unmounted itself and now does not work

I have a strange problem. Working on an OS 10.9.5 MacBook laptop. Last night, I was exporting a 20-something GB Aperture library from my WD 2TB drive to another hard drive. I left, and when I came ...
4
votes
1answer
562 views

Accidentally ejected External drive while downloading file, now having problems reading

I'm hoping someone can help! I recently downloaded a torrent directly onto an external hard drive, (using a 2009 MacBook Pro and 1TB Seagate Expansion portable Drive) somehow during the download the ...
4
votes
1answer
5k views

Resizing Mac OS partition - macOS High Sierra

Hi I am having issues trying to resize my Mac OS partition, I previously had a very large recovery partition almost 100gb as a result of removing my linux installation, I since resized this to 650mb. ...
3
votes
1answer
3k views

Partition on HFS+ external drive: “Invalid number of allocation blocks”, file system check exit code 8. Unable to repair, even in recovery mode

As the title says, I'm getting the error "Invalid number of allocation blocks" on a particular HFS+ partition of an external drive. I am unable to repair, even in recovery mode. Log results when I ...
2
votes
2answers
4k views

Accessing events on external drive in iMovie '11 on Lion

I have my iMovie events stored on my external harddrive (located in a Synology NAS). It worked like a charm with iMovie '11 on Snow Leopard. I then received my new MBP with Lion and the external ...
2
votes
1answer
5k views

Partition Type : FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

I know this has been asked on here before, and similarly to the others I have not backed up my data... I found this duplicate and got lost in the answer and didn't want to mess too much with the ...
1
vote
1answer
2k views

Hard drive no longer accessible

This is a 4 TB hard drive formatted in Mac's Disk Utility as a single non bootable Exfat partition with the drive letter G. It worked fine before I decided to make a clone drive of my C bootable drive....
25
votes
4answers
24k views

MBP SSD upgrade - which settings to change?

After replacing the harddisk drive in MacBook Pro with a Solid State Disk I am wondering which settings I should change and how. Thinking of things that are supposed to protect the SSD like ...
25
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3answers
13k views

How do I eject the Time Machine backup drive automatically after each backup?

How do I set Time Machine to eject my external Time Machine backup drive automatically after each backup?
41
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3answers
34k views

What are the differences between journaling HFS+ and non-journaling HFS+?

I'm about to format an external hard disk drive (HDD). What are the key differences between journaling HFS+ and non-journaling HFS+? Apart from the fact that one has journaling and the other does not,...
14
votes
5answers
86k views

What is filling up my hard drive so fast?

Last night (Because my hard drive was almost full) I freed about 4GB. Then I came back to my Macbook about 3hrs later (I left it idle) and Its was full again. Is something is eating my mac? If I go ...
15
votes
3answers
96k views

How can I delete a partition (coreStorage logical volume?) from the Terminal?

I finally understood why Disk Utility will not change the partitions on my HDD, even though I added the most recent one myself (maybe significant: to test Yosemite DP) with it. Now I see it says it ...
13
votes
5answers
35k views

Is there a utility for mac that shows the information of an SSD like the health etc…?

I am wondering if there is a utility for the mac that allows you to see the details of an SSD like the health of the drive, TBW (total bites written), how many running hours etc... In researching for ...
15
votes
5answers
27k views

What are the sector sizes on Mac OS X?

I read on the HFS Plus Wikipedia page that the default sector size on a Mac is 512 b. However, I also read that Macs support 4kb sectors. How can I determine which I have, 512 b or 4 kb sectors? I ...
9
votes
5answers
107k views

How to restore Mac OS X on a new hard-drive?

I am going to upgrade my MacBook Pro hard-drive, but before doing so I'm trying to figure out how to restore OS X on it. My DVD drive doesn't work so I cannot re-install from the DVD. I have a recent ...
21
votes
7answers
57k views

What format for my external drive allows use with Mac and Windows?

How can I use my external hard drive on Mac OS so I can modify/edit files on both OS's: Mac and Windows? How should I format it?
18
votes
5answers
2k views

Does the use of SSD give one a dramatic performance boost?

I use Mac book pro 15", and it's time to buy a new one. For HDD, now I see a new option of SSD, which is pretty expensive. I can expect shorter boot-up time and faster access of files, but I'm not ...
14
votes
10answers
104k views

MacBook HD “Other” all of a sudden almost full

As you can see in the below image, my HD "Other" category is almost full. A couple of days ago, I randomly kept getting a popup saying that my disk was almost full. Then I went in and noticed the ...
10
votes
7answers
3k views

What are the best disk cloning tools?

Money is no object. I want a bit for bit perfect copy of a hard drive/partition which is bootable (is either possible) to be used in a backup regimen. I have heard of some tools but your ...
6
votes
2answers
7k views

What terminal command or program can list an SSD's Power On Hours?

I'm looking to script using the unix shell the retrieval of SSD (and HDD) data that disk utility shows in the information window. I'm immediately interested in the Power On Hours and Power Cycle, but ...
6
votes
3answers
7k views

Best file system for an external hard drive sharing between OS X and Windows

I would like to buy an external hard drive that I'll use on Mac OS X and on Windows, but I don't know the best file system for it (reading and writing on the both system). I know I can used FAT32 ...
6
votes
1answer
2k views

How can I recover files from a failing hard drive?

I am in the process of trying to recover files from a failed MacBook hard drive. While I've already replaced the drive in the machine itself and installed a fresh copy of OS X, I have the old drive in ...
6
votes
3answers
21k views

What is an SSD drive's negotiated link speed?

When I look at my Apple SSD TS256C (Toshiba) in the System Profiler on my MacBook Pro (Late 2011), I see: Link Speed: 6 Gigabit Negotiated Link Speed: 3 Gigabit Why is that? Does that mean that ...
6
votes
2answers
7k views

Repair an exFAT drive on Mac OS X after it's been improperly disconnected

Very often an exFAT external disk stops appearing in OS X. It doesn't appear in Disk Utility, Finder, diskutil list or About this Mac/System Report/USB. The only way I have found to fix it is to boot ...
5
votes
1answer
2k views

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, ...
5
votes
2answers
690 views

What process is accessing the hard drive?

I can hear the hard drive chugging away when it should be idle. Some process is writing/reading from it in semi-random bursts, let's say once every second. Very annoying and wasteful. I tried ...
4
votes
1answer
21k views

How to restore from a Time Machine backup when there is already a user account set up?

I can't figure out how to access my Time Machine backups since Apple replaced a defective hard drive. Some Background: My setup: iMac 24" (Early 2009), 3.06 GHz Core 2 Duo, OS X 10.7.3. I have been ...
4
votes
4answers
82k views

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 ...
3
votes
2answers
931 views

Is there a fast way I can clone a partition on to another drive using a sector by sector copy, instead of copying individual files?

I'm trying to transfer a 4 TB Time Machine backup from one USB 3 hard drive to another. I'm currently using SuperDuper to do it, and it's going to take upwards of two full days to perform the copy, if ...
2
votes
2answers
8k views

Resizing HFS+ volume after cloning

I cloned a disk containing an HFS+ volume to a larger disk using the command line dd utility. Now I want to grow the HFS+ volume to fill the new disk. There's an EFI partition before the HFS+ volume ...
13
votes
7answers
41k views

How can I keep my fan from staying at full speed after replacing the hard drive?

I replaced a hard drive in a 2011 iMac (Core i7), though it was a standard hard drive and didn't have a location for the S.M.A.R.T. cord. (Or at least I think that's what it was.) Since then, the ...
10
votes
1answer
4k views

Prohibitory sign on boot after Sierra update, can't mount disk anymore

A few days ago I decided to update to Sierra from El Capitan on both the disks on my MacBook Pro (mid 2012); the update on my SSD went without a hitch so I decided I'd update my other disk, too. I ...
8
votes
3answers
8k views

Is there anyway to expand my MacBook Air's hard disk?

I have a 2011 MacBook Air(11-inch), I am using OS X 10.9, but I only have 64GB Flash Storage, and I want to expand the storage of MacBook Air's hard disk. I asked geniuses at Apple and they told me ...
7
votes
1answer
444 views

Diagnose disk I/O per application

I have a Leopard system which feels rather sluggish, and which I suspect may be disk-I/O-bound. While I know how to check which app is using CPU or memory (top or Activity Monitor), I don’t really ...
7
votes
4answers
100k views

How to make my iMac recognize my USB external hard drive?

I just bought a new Seagate hard drive for Time Machine backups. I plugged it into my iMac and the hard drive never showed up in Finder. The drive does not appear in Disk Utility and the command ...
6
votes
1answer
2k views

How can I do a fresh install of OSX Mountain Lion onto my SSD for my Macbook?

My macbook is sluggish and has so much stuff that I don't use anymore and just want to start over from scratch basically. I did a time machine backup just in case something goes wrong. New blank SSD ...
5
votes
3answers
13k 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 ...
5
votes
2answers
68k views

Cannot Unmount Mac OS X Base System Disk

My Mac running Lion was being slow, so I was decided to reinstall OS X. I don't have any Time Machine backups. Everything went file, but in the middle of the installation, it got stuck, and later the ...
5
votes
2answers
9k views

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, ...
4
votes
2answers
3k views

trimforce enable does not work

I am using 2009 macbook pro and I wanted to upgrade the default hdd to a Samsung Evo 850. I have succeeded to transfer everything from a Time Machine backup, but when I wanted to enable the trim by ...
3
votes
2answers
7k views

Which format for external disk for performance?

I'm using OS X Mavericks and just got a new external hard disk. I don't need to share it with a PC (so no need for FAT) but I do want it to have better I/O performance. I'm a bit confused by the ...
2
votes
3answers
1k views

For bad and/or marginal blocks on hard disks, can anything be more effective than a single pass of zeros?

There's a good discussion in Apple Support Communities – Disk Utility: for bad blocks on hard disks, are seven overwrites any more effective than a single pass of zeros? (2011-04-21) A highlight: ...
2
votes
1answer
26k views

Attempting to revert to Mac OS X Mavericks, now can't get out of OS X Utilities!

Here is my situation: I have an MBP Retina 2013 with an SSD drive which I ran with Mavericks with no problems for about almost a year now. I recently upgraded to Yosemite which seemed to work well ...
1
vote
1answer
689 views

SSD adapter for optical drive

I'm going to add a SSD drive to my macbook pro. I'm wondering if the optical drive adapter can have any influence on the disk speed, taking it down from a SATA III to a SATA II or I.
1
vote
4answers
60k views

Why is my hard drive still full after deleting files?

I'm new to Mac. I have deleted many files from my applications folder, downloads, music, etc. to make clean Mountain Lion installation. After installing Mountain Lion I can still see in About This ...