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

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1answer
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Can't restore to backups after removing disk in Time Machine

I've been using a WD 2TB HD for the last two months to handle my Time Machine backups for my Macbook Air. Yesterday, I wanted to set it up to handle backups through the network. In the Time Machine ...
6
votes
2answers
17k views

Unable to format / erase hard drive

I have an external HD that died on me a while ago and I'm trying to see if I can format / erase it to start using it again. The disk does not show up in Finder but I can see it in Disk Utility. When ...
6
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2answers
1k views

Encrypted external drive usually prompts for password, despite being in keychain

I have an external encrypted drive, and almost every time I plug it in, it'll ask me for the password, even though it's already in my keychain. If I type the password in, it'll mount as expected. ...
5
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4answers
289 views

Time Machine External Drive

What factors are important when selecting an external hard drive for time machine backups?
5
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1answer
1k views

External Hard disk 500 GB free but can't copy 8 GB data

I have WD external hard disk, which was working fine. Its MS-DOS formatted. I have downloaded a file in .mkv, which works fine, and isn't corrupted. Upon copying the 8 gb file, it says "The file is ...
5
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2answers
2k views

Can I use an Advanced Format drive in a Late 2010 13" MacBook Pro?

I have the 13" Late 2010 MacBook Pro, and the 250 GB Hard Drive is way to small, so I'm looking to get a bigger one. I wanted to upgrade to a 750 GB WD Scorpio Blue (WD7500BPVT), but I've read ...
5
votes
1answer
2k views

How can I tell which volume the operating system is on?

I'll admit that I am kind of rolling multiple questions in to one here so please forgive me and try not to knock me for it. I am new to Mac but I'm trying to port one of my Java applications to OS X. ...
5
votes
1answer
5k views

Disconnecting disks from Airport Extreme

Since Apple released the new Airport Utility with the simplified UI, there doesn't seem to be an option to "Disconnect All Users" to kick all users off a hard drive to safely remove it when connected ...
5
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4answers
202 views

How do I determine the speed of a disk drive?

I'm looking for a way to determine the read/write speed of a disk drive, either by looking up some system information or running a simple benchmark test utility.
5
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8answers
21k views

Checking for bad blocks without formatting

My Mac tends to pause every now then when preforming simple tasks such as right clicking, opening menus and typing (It actually just froze when I started typing this question.). I've read in a few ...
5
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3answers
9k 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 ...
5
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2answers
5k views

How can I mount an encrypted disk from the command line?

When I type diskutil mount disk3 in the terminal, it says Volume(s) mounted successfully. However, the disk is not mounted and I can confirm this by opening the GUI of Disk Utility.app and also the ...
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5answers
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How to eject my external drive when my Mac refuses because of Spotlight?

I have plugged an external disk to my Mac. Now, I want to eject it. But my Mac stubbornly refuses and says that an application may be using the disk. I have not launched any app neither opened any ...
5
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2answers
19k 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 ...
5
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2answers
2k views

How can I make my computer believe a disk image is a hardware disk?

I'm trying to do some research on TimeMachine right now. I don't want to purchase an external hard drive, just to learn about some software, and so I'd like to be able to tinker with the settings, by ...
5
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1answer
2k views

How can I modify an existing FAT partition without losing its data?

I have a 1tb hard drive. Long a go I split it it into two partitions. One I left as a Mac OS extended (journaled) with 990GB and one as FAT with 10GB. Now I would like to add about 100GB to the FAT ...
5
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2answers
7k views

Error-“Unable to write to the last block of the device.”

I am trying to setup a new hard drive into my Macbook Pro. However, I keep getting an error in disk utility that states, "Unable to write to the last block of the device." I saw another person was ...
5
votes
1answer
5k views

What kind of encryption does Mac OS X Extended (Journaled, Encrptyed) use?

Since my primary hard disk is encrypted with FileVault2, I also wanted my backup drive to be encrypted. I plugged in my external drive, brought up Disk Utility, and went to erase/format the disk. I ...
5
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2answers
5k views

Aperture: Library over multiple Hard Drives

I switched to Aperture some time ago. And right now, the moment has come that I want to save some space on my internal hard drive. What I found on the Apple website is this: I can't seem to find ...
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5answers
5k views

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 ...
5
votes
2answers
8k views

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 ...
5
votes
1answer
345 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 ...
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2answers
899 views

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 ...
5
votes
1answer
5k views

Can I have two Time Machine partitions on one hard disk drive?

I know that someone can use a partition on a hard disk drive for Time Machine, but is it possible to specify more than one partition on a single drive for this purpose? The scenario: My partner and ...
5
votes
4answers
7k views

9GB com.apple.coresymbolicationd file in Caches

I'm trying to free up disk space, and I came across this: I've read reports of a 600M file, or a 1GB file but never something like this. Is it safe to delete or does rebooting frequently help ...
5
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1answer
399 views

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 ...
5
votes
1answer
722 views

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 ...
5
votes
1answer
394 views

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 ...
5
votes
1answer
4k views

can i delete “developer-old” folder?

I've got a "developer-old" folder besides for my "developer" folder. "developer-old" contains "headers", "SDKs", etc folders. It'd be nice to delete this folder bc it takes up 10GB. Can I?
5
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3answers
11k views

fsck and Disk Utility won't repair Volume: invalid b-tree node size

I accidentally wrote some .iso data to a disk through dd by mistake. I cancelled the command after just 2 seconds but that was enough to wipe the first EFI partition (200MB) and a bit of the second ...
5
votes
2answers
866 views

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 ...
5
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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 ...
5
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2answers
822 views

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?
5
votes
1answer
3k views

Extremely slow write speed to encrypted external drive on Mavericks

Writing to a fully encrypted USB flash drive on Mavericks is extremely slow. The drive model I used for testing was a Kingston DataTraveler Ultimate 3.0 G3 (64 GB). I tested transfer speeds by ...
5
votes
2answers
638 views

Unable to format pendrive, diskutil error

When I insert my USB Pendrive in my iMac i see this message: I tried to format it both with DiskUtility and with diskutil command in terminal but I get this error: iMac:~ User$ diskutil eraseVolume ...
5
votes
1answer
949 views

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 ...
4
votes
2answers
7k views

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 ...
4
votes
4answers
15k 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 ...
4
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2answers
497 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
5k views

Where are notes stored in Mountain Lion

I ha a hard drive that died recently in my macbook, I've replaced the hard drive etc so no issues there. Unfortunately, it appears I wasn't backing up the notes app to iCloud, and I really need to get ...
4
votes
4answers
600 views

Mac Application to defrag my Mac drive

I work on media files as per my profession. I find my Mac (Mac Lion) going slower day by day. I think it will be beneficial to defrag the drive but didn't find any Apple tool for it. I want a an ...
4
votes
2answers
171 views

When does macbook second HD work?

I changed my optical drive with my old HDD and it works great. Now i have a SSD samsung 840 evo 250 GB. The battery doesn't last as long as before, but still works quite well. The only thing it ...
4
votes
5answers
40k 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 ...
4
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3answers
3k views

Will upgrading Mac Mini hard drive void AppleCare Warranty?

After purchasing a Mac Mini, I wanted to replace the hard drive from a 5,400 rpm hard drive to a 7,200 hard drive. Will this replacement void my AppleCare warranty?
4
votes
2answers
4k views

Is there room for two drives in the 27" 2012 iMac?

I've looked around a bit, but can't find anybody saying whether there is room in the new slim iMac for an extra internal SSD. I used this tutorial about a year ago to add an additional SSD to my Mid ...
4
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1answer
661 views

Migration Tool VS CCC

I have a 2010 Mac Pro. Still running Snow Leo, as there are still quite a few programs that are PPC and I'm not prepared to update all of them. My current boot drive is 1.5TB and I'd like to swap it ...
4
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2answers
1k views

JDiskReport is damaged, can't be opened

I have tried downloading and running JDiskReport 1.4 a few times now, and after unzipping it and clicking on the executable I get the message: "JDiskReport" is damaged and can't be opened. You ...
4
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3answers
3k views

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 ...
4
votes
1answer
1k views

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 ...
4
votes
1answer
341 views

How fast should my MBP internal drive be?

I'be been experiencing an ongoing (if not precisely measurable) feeling that my MBP is underperforming, and it seems to be related to disk IO. I recently downloaded a disk benchmarking tool, to see ...