refers to formatting, or erasing a disk, deleting all data on the disk

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How can I format a USB drive on a Mac so that it works on all old PCs as well?

I've tried FAT32 but old PCs won't read it. I could try NTFS but then Macs would treat it as read-only. I'm pretty sure I've seen USB sticks that work on Macs and PCs but I don't have any to hand so ...
-1
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0answers
12 views

Why does my external HDD have an EFI partition?

When I ran diskutil list on my Mac, it showed an EFI partition plus my normal partition on my external disk. Why is it there? If I edit my EFI partition and it gets corrupt, will a format change it ...
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1answer
2k views

Failed to make bootable USB drive and now I can't even format it

I want to do a fresh install of Yosemite and I got a brand new 8GB flash drive and I followed this tutorial. I formatted the USB drive and was copying the Yosemite installer, however I got the ...
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8answers
30k views

Disk Utility won't allow me to delete and resize partitions

I'm running OS X 10.9, and I had a linux partition when I updated from 10.8. Since I updated I can't boot on linux, which is no big deal for me. However, I would like to delete the partition that is ...
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1answer
1k views

SSD formating trouble and mysterious disks

Two days ago suddenly Apple services started to fail on my Mavericks machine. I couldn't shut down (logind - or something like that - crashed but could not be force-quit). I shut down twice from ...
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2answers
9k views

How to partition an SSD that fails with error 69888 - couldn't unmount disk?

I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there ...
2
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2answers
302 views

JPEG XR support

What kind of support does OSX have for JPEG XR (also known as HD Photo)? I know that there is a Photoshop plugin for it, but are there any other forms of support such as an image preview or other ...
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2answers
5k views

Error: “couldn't unmount disk” keeps coming up when formatting external HD to eXFat

I have a WD "my Passport" external HD that is currently formatted for a PC and I would like to format it to eXFAT. Every time I hit "erase" in disk util it just comes up with the error "couldn't ...
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1answer
223 views

Are all installations of OS X (10.8+) Case Insensitive (by default)?

I'm going to be getting a refurbished machine and rather than keep my current OS (10.6.8), I need to upgrade to at least 10.8, in order to be able to communicate with devices that use iOS 9 (since you ...
2
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1answer
149 views

Cannot erase SD card with Disk Utility (El Capitan)

I have this SD card that I am trying to use to backup photos on a Windows computer. After using the SD card on the Windows computer, and copying the photos back on a safe drive, I cannot erase the SD ...
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5answers
541 views

Portable encrypted USB stick

I would like to have an encrypted USB stick that I can use with Windows and OS X. I could format it as FAT32 and then have a encrypted image files (more than one due to the file size limitation of ...
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0answers
29 views

How should I properly format my iPod nano 4th generation?

I've been the happy owner of an iPod nano 4th gen, 8Gb for a few years. Over the years, I've added and deleted many songs, lyrics, album art, etcetera, and I recently assumed that something was ...
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1answer
90 views

MacBook does not mount, does not boot, does not read drive

When i press alt on my MacBook during startup, it only shows a disk that i used to have Windows installed (which is now empty). I erased that disk when i was last logged in on OS X. Then i tried to ...
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1answer
18k views

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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0answers
30 views

MacPro internal HD unreadable when moved to external USB Dock - and vice-versa

Since I just installed a NAS, and I want to transfer several TB from my Mac Pro's internal hard disks (4 of them), I wanted to make it faster by connecting those hard disks directly to the NAS using ...
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1answer
68 views

Can I set up Contacts phone numbers format

iPad iOS 9. I use AT&T. iPad Air 2 I spend a lot of time in Mexico where the phone number format is completely different from the one in the States, and in Contacts. Also, Contacts will not let ...
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2answers
5k views

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
95k views

How to format a disk to NTFS using Mac OS X

I am looking for a simple GUI based way to format drives to NTFS (Windows) on Mac OS X Snow Leopard.
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0answers
15 views

Selling old Macbook pro 1,1, need to re-format the drive

I have an old MacBook pro currently running snow leopard. I have a time-machine back up disk, but is there a way to reformat everything, leave the OS on the machine, then sell it? The original ...
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5answers
46k views

I can't write to my flash drive, and it is already in the MS-DOS (FAT) Format. Why?

This is my first question on this website. I am using a Mac Air, and I have a flash drive in which I can read from. I am able to copy files from this onto my Desktop, or anywhere on my computer for ...
31
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3answers
19k 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 ...
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1answer
111 views

Change MacBook Pro OS X Apple ID ownership [duplicate]

Over a year ago I bought a second hand MacBook Pro on ebay. Unfortunately the original owner did not reinstall the operating system and in fact it came together with Photoshop and Microsoft Office. ...
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1answer
21 views

why are my iPhone4 videos different in size?

Some videos I take are square and 640 x 480, while others are 1920 x 1080, data rate changes with size as well, so quality is much better on the larger size - seems to be random - how do i set the ...
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0answers
23 views

Are slow format speeds indicative of more severe hard drive problems?

I have an mid-2011 iMac, that has 4GB of RAM and a 500GB HDD (not SSD). Over the past few months I have experienced: Fairly frequent beach balls/general system slowdowns A worrying number of errors ...
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5answers
48k views

How do I make a bootable USB flash drive a Mac?

Does anyone have a Terminal command-line recipe for making a new bootable USB flash drive for one of the new MacBook Air's? Is there a way to dd copy the USB boot device that comes in the box and ...
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0answers
45 views

Repair Disk failed

I try to repair a disk because my Mac still is on grey screen during start. I created a USB Yosemite bootable and I can use Terminal. I tried with: diskutil repairvolume disk0s2 But I get the ...
2
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1answer
105 views

Find specific attached disk, not volume, by Applescript

I have a script I use to format any inserted SD card, copy data from specific folders to it, then eject. Each format/copy is triggered manually, as part of a batch process involving maybe a hundred ...
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0answers
240 views

Unable to format external HDD

When creating a partition with GUID Partition Map Scheme in Disk Utility, I'm getting "Partition failed with the error: Unable to write to the last block of the device". Same message when I try to ...
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1answer
34 views

I am trying to erase and reformat drive with snow leopard, but don't have the install DVD

I have a 2009 MacBook Pro running Snow Leopard, and I'm selling it to someone. Want to erase and reformat the drive but I don't have the Snow Leopard Install DVD. Is there any way to do this?
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1answer
182 views

How to recover from accidently diskpart'ing an OS X drive, destroying everything?

Ok, so, I just got my Mac back after 5 months in the repair shop. I went to install winblows 7 via Boot Camp Assistant, but was having issues. I went into diskpart, and not remembering how to use it, ...
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2answers
2k views

Difference in disk usage MS DOS vs Extended Journaled

Searches on Google and the Apple forums didn't get me any answers or couldn't clarify this for me, hence this question. I have two following external USB hard drives connected to my iMac: "Lacie1" ...
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1answer
690 views

Should I reformat a disk if Disk Utility asks me to?

I have a FAT32 external disc that was suddenly unmounted as I was using it. When I reconnected it and tried to Repair it in Disk Utility, I got the following messages: Verify and Repair volume ...
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1answer
58 views

Tried to reinstall osX and ended up getting folder with questionmark on boot

Today I decided after 6 years to format my MacBook Pro 2009 laptop. Originally I had Snow Leopard on it (I still have an unscratched cd) but in some point back in 2012 a friend installed (using his ...
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1answer
275 views

Apple MacBook Pro 2013 with 512Gb SSD cannot install OS X

I had an issue running an App and the vendor suggested I should revert to the earlier OS X 10.10.3. I located on Time Machine the backup version I needed, waited for the format and restore. I then ...
0
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0answers
92 views

How to solve continuing error “internal disk needs repair” after installing a 8 TB HDD in Airport Time Capsule (A1470)

I've replaced the failed 3 TB HDD (SATA 6Gb/s 64MB Cache) with a model number (ST3000DM001) in my TC (A1470) with a 8 TB HDD (from HGST model no HUH728080ALN600). I've used the Airport Utility to try ...
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0answers
55 views

Initialize 6 TB internal hard drive

I've found it both economical and flexible to use a docking station with internal hard drives (the ones that look "naked", i.e., have no plastic casing) for backups. I use this docking station to ...
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0answers
39 views

Windows formatted disks owned by $USER, while Mac formatted disks owned by “root”, right?

I noticed that some disks were owned by $USER and some by root: $ ls -l /Volumes total 88 drwxrwxrwx@ 1 jdoe staff 8192 Jul 14 10:22 USBdrive drwxrwxrwx 0 root wheel 0 Jul 14 15:54 ...
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0answers
51 views

Drive format for Sony Blu-ray

I formatted my drive from my Mac in FAT32. I'm using the drive on a Sony Blu-ray player (BDP-S5500. When I copied my files (movies) to the drive from my Mac, ._ was placed in front of each title and I ...
0
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1answer
24 views

How can I reformat a USB

I used by USB to add as iso file into it. sudo dd bs=4m if=my.iso of=/dev/disk1 Now I want to get the USB back to normal. but the erase button in Disk Utility is disabled. How can I reformat this
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4answers
8k views

How to erase and reformat SD card to ext3 on my macbook to prepare it for my raspberry pi

I'm trying to reformat my 32G SD card to prepare it for my raspberry pi. My GUI program on my mac does not allow me to format it to ext3 which is what i'm told to reformat it to for my raspberry pi. ...
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0answers
53 views

Principal HDD doesn't appear in the list of disks to format

I'm using the recovery tools (from internet), but I can't format the internal 500GB HDD. Entering diskutil list in Terminal I get the following output: -bash-3.2# diskutil list /dev/disk0 #: ...
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4answers
1k views

Pros and cons of wiping a new Mac?

Coming from the PC world, most made-to-order manufacturers (e.g., Dell, HP, Acer, etc.) all have annoying little addons which I consider spyware/bloatware--things like toolbars with ads. When buying ...
2
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2answers
163 views

Change drive “block size” to 4096

I just bought a 4tb hard drive and enclosure and attempted to encrypt it with truecrypt. I errored with a message saying the block size must be 4096 bytes for >2TB drive. How do i alter the drive to ...
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1answer
40 views

Questions regarding disk format

I'm doing a fresh install of Yosemite on my mac, but stopped at format step: I noticed various options: plain format encrypted case sensitive So, I'd like to know: Is it possible to install ...
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1answer
194 views

MacBook 5,1 Upgrade, Leapfrog to Yosemite and MBA Backup

My 2014 MacBook Air was recently stolen, but I have a full backup available via Time Machine saved to an Airport Extreme base station. For now I'm using an old MacBook 5,1 with an Intel Core 2 Duo ...
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5answers
34k views

Lost password on Mac OS Extended (Journaled, Encrypted) Drive. Want to reformat it

I am using a Seagate Free Agent Desk external drive as my Time Machine on a modern iMac running Lion. I made the mistake of encrypting the drive, and I do not remember the password. I dont mind losing ...
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0answers
269 views

I get this error when running sudo dd if=/dev/zero of=/dev/rdisk# bs=64k in Terminal

I'm following the steps explained in this answer: sudo dd if=/dev/zero of=/dev/rdisk# bs=64k but get an error dd: /dev/rdisk2: Input/output error 1+0 records in 0+0 records out 0 bytes transferred ...
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1answer
37 views

MacBook Optimal Disk Formatting

What's the optimal formatting for a MacBook disk? My disk seems to be formatted as a LVG (Logical Volume Group) and it seems super slow...
3
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2answers
17k views

Formatting USB Disk As EXT3 On Mac

How can I format a USB disk as ext3 using OS X Yosemite? I want to use it on another system that is linux based but I wish to format it first before connecting to the linux system.
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3answers
16k views

Changing a Volume's “Device / Media Name”

I know a Mac volume can be renamed... obviously. But if you look at the output of diskutil you will see that a volume also has a "device name" that corresponds to the name it was given when it was ...