Questions tagged [disk-format]

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

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Finding the right directory to install applications into?

I just downloaded the MS Teams app for MacOS and upon installation was asked if the app should be for all users/ current user/ installed on hard drive. I understand the first two, but was wondering ...
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MacOS Bug Sur can format drive but can't mount it

I have an USB-stick and I can format the Stick but when I try to mount it following error occurs: The error is on german, it means "Mounting of "Ohne Titel" has failed. (com.apple....
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Reviving unmountable & unformattable usb drive

I have a USB drive, which was a bootable Windows drive, which I seldom used. Recently I tried to format it, and it went corrupted (I hope). I'd like to find out if it's broken or not. I'd tried to ...
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Resizing “VM” APFS volume on osx

I'm trying to free up space but 150gb is taken by "other volumes". diskutil list shows that "VM" volume is taking 150gb. How can I resize it to be smaller? $ diskutil list /dev/...
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How can you verify when a drive was last formatted?

I'm trying to determine the date a drive on a MacBook was last formatted. I used to be able check the inode birth time of the root volume, but it appears a recent MacOS update may have changed this ...
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macOS Utilities doesn't recognize internal ssd (but normal usage is working fine)

I own an early-2015 Macbook Pro and by trying to format it for reselling purposes I've got faced with a curious and annoying problem. macOS utilities does not recognize my internal ssd. Be it by ...
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How do I use MacOS Terminal or other app to format an MBR FAT32 SD card as a 0x0C partition, rather that 0x0B?

Apple's Disk Utility app can format an SD card as MBR FAT32; but in the Terminal, I confirmed the SD card's partition is in fact 0x0B: > sudo gpt show /dev/disk3 start size index contents ...
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1answer
31 views

Linked MBP to my account even after erase

I have to send my MacBook Pro M1 back to Apple as a replacement. I tried to format it but it didn't work (I think)(I used disk utility and erased Macintosh HD) as it still shows the activation screen ...
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1answer
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Problems Reformatting SSD on mid 2015 Retina 15" MBP

When I purchased the subject laptop last year I replaced the original Apple SSD with a non-Apple 2 TB SSD. For years I have always kept OS and data on separate drives or at least separate partitions. ...
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1answer
36 views

Which partition do I need to format or fix in order to install Sierra or lion?

I have tried in vain to get my MacBook Air back up and running. I did a system restore or reinstall a while back and something broke. I've tried command+R and a bootable USB, there doesn’t appear to ...
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Issue with clean install of macOS on early 2015 MacBook Pro

I tried to install FreeBSD on my SSD on my mac since I was guessing they should be working, but there no drivers for macos and I decided that I should go back at Big Sur. I formatted the disk via the ...
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1answer
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How to create a bootable USB Drive that will boot on BOTH an Intel Mac and a PC

I recently created a bootable USB Thumb Drive containing a Linux Live Distro. I created it on a PC running Windows and tested it successfully on the same PC. Now I want to run the same Linux OS on my ...
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Will the dd disk clone commandline include partitions of various formats on macOS Catalina? [duplicate]

My original question was closed because it's assumed this thread (What is the best way to clone a disk between two Macs?) answers my question, so I am rephrasing my question and title. The author in ...
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Write protecting a linux drive on macos, to prevent any accidental formatting

I have an external drive plug into mac os, in which i install linux on, for a dual boot of linux and macos. I am running MacOS Catalina 10.15.7. Everything works great, except one major flaw with ...
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2answers
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Macbook Air Full Factory Reset?

I want to reset my Macbook Air Early 2015 but not just simply deleting the disk and reinstall it with macOS Utilities menu. What I mean is "full factory reset." I want it to be like it just ...
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1answer
593 views

How to change allocation size for external ssd on mac?

I recently purchased a Sandisk Extreme SSD to work with Mac and Android. Is it possible to create 2 exFAT partitions of the drive? (Currently, I managed to do a combination of exFAT and HFS/Mac OS ...
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How to “securely” erase my MacBook's SSD

I would like to sell my Macbook Pro, but I want to make sure that there is no way to retrieve the deleted data from my SSD. Is there a way to completely delete all files on a hard drive so that even a ...
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Screen hanging after choosing to Fix Disk Image - restore to previous working state

I believe I've gotten myself into a bit of a mess. I went to wipe my disks ready to handover my iMac. I wiped the disks, then accidentally restarted the machine. Got the "?" folder appear. ...
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177 views

Sandisk Ultra 3.0 128GB USB can't be detected on my Mac or Windows 10 after removing it

I bought a Sandisk Ultra 3.0 128GB USB for my Mac, a few years ago, so I could move files to windows if I wanted. All was well and working fine until I accidentally unplugged the USB from my Mac while ...
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1answer
168 views

Macbook pro 16inches 2019 fails to reinstall catalina on recovery mode after erasing hard drive, and T2 chip dissallows to boot from external drive

hope you can help me here. My MacBook Pro 2019, 16 inches, with a T2 security chip, systematically times out when trying to reinstall Catalina in recovery mode, after erasing the main drive. The T2 ...
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1answer
167 views

Help with Disk, won’t boot

I was trying to factory reset my 12” MacBook A1534. Went as instructed into recovery mode and clicked “erase” for the internal disk. While I erased I went with the default set, “APFS format.” The ...
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SD Card will not erase/format or unmount during erase

I'm trying to erase and reinstall Raspberry Pi OS to an SD Card, with no success. I followed the directions in another thread but am still stuck. So far here's what I've done (in Terminal after ...
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1answer
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Is it possible to make a mbr legacy bootcamp win 10 from a gpt partitioned catalina hdd 10.15.7 with bootcamp 6?

I tried to install win10 to ssd via efi boot on my macbook air 2012, it ran pretty well as far as performance, but because it's pre-uefi it makes it the garbage windows version with no sound, no ...
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Can an ext4 formatted hard drive work on MacOS out of the box [duplicate]

I need a cross platform file system for an external hard drive that will be used on both Linux and MacOS. Will an ext4 file system work on MacOS right from the moment it is plugged in?
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Can't format internal (USB) drive because of Read-Only [duplicate]

I have a macbook (running MacOS Catalina) connected to a HP 3005pr 3.0 Port Replicator. This port replicator has a internal USB disk, I want to format this disk but am not able because it is Read-Only ...
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Corrupt internal APFS Catalina disks can’t boot & be removed

Internal disk (disk0 & disk1 APFS) and internal PCIe (disk2 & disk3 APFS) are corrupted. Currently booting from an external usb thumb drive (disk4 & disk5 APFS) and I can’t seem to erase/...
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What name, format, and scheme should be chosen in order to “factory reset” a MacBook Pro?

I am following What to do before you sell, give away, or trade in your Mac and during step 7 (Erase your hard drive and reinstall macOS), the fourth step is "Click Erase, then complete these ...
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1answer
625 views

How to remove bluetooth device by clicking “x” when there is no “x”?

I'm following instructions on what to before you sell, give away, or trade in your Mac and when attempting step 6 (Unpair bluetooth devices), I attempt to 'move the pointer over device that you want ...
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1answer
295 views

My USB is basically gone after 'diskutil zeroDisk /dev/disk2'. What do I do? [closed]

My USB was screwed up after I did something wrong while using bootcamp (don't remember the details). I did a bunch of stuff but it doesn't really matter as here's the current situation: My USB won't ...
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Boot Question Mark. Unable to write to last block of the device

I am having trouble with my MacBook Air a1465. Turning it on displays an image of a folder with a question mark inside. Looking for how to solve the problem, I tried to clean the NVRAM, with ALT + CMD ...
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1answer
42 views

Format disk in mac with a lot of reading and writing [duplicate]

What I want to do is Format my SSD disk of my Mac Book Pro (2019), but I want to do it in a VERY safe way. So that there is no trace of the deleted files and nobody can access them anymore. That's why ...
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2answers
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How best to reintroduce files after clean MacOS install

I'm having seriously annoying issues with my new MBP. Processes crashing extremely frequently, so that I now have to close about 7 or 8 crash reports before I shut down at night. Issue here: "...
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Are my external disks fried? Can they be salvaged, formatted or partitioned back to Exfat?

TL;DR I have two brand new 2TB JMicron Generic Media external 2.5" HDDs and one old 128MB flash drive. All three were usable (they've been used for transferring files, not Time Machine). Now both the ...
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1answer
853 views

How to stop Disk Utility?

I'm assuming this USB stick is toast & I'm not going to be doing anything in future with it except for one last short flight into the bin. The stick gives the "This device is unreadable. ...
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797 views

“Unable to write to the last block of the device” After Catalina OS X®

I tried installing Catalina 10.15 from an external USB drive created on windows, because from Apple store a message "Could not contact server" appeared. The setup was going great and at the end the ...
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1answer
628 views

Unusable 2.5" external HDD. Partition failed with the error -69760: Unable to write to the last block of the device. Exfat only? Repairable?

Update 1: Somehow, after unconnecting and re-connecting, the original disk (disk1) has now returned to original state, with the readme file as well! I still have another disk which is not working. ...
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1answer
46k views

What is Macintosh HD - Data - Data?

I just formatted my Macbook Pro. Using macOS Catalina 10.15.4 At boot, I pressed Cmd+R to enter recovery. I then used the disk utils to erase the "Machintosh HD - Data" partition. I then went over ...
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Is there a way to change the output format of the screen recording using terminal?

I'm using macOS Catlalina 10.15.4 (19E287). I have some screen recording to do and I intend to use the build in screen recording with the screenshot app. The problem is I don't want the file to be ...
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1answer
454 views

Unable to format USB disk (Error: -69877: Couldn't open device)

I have an external USB stick (Kingston DataTraveler 3.0). I can read the files on it (I have some movies that I can play) but I can't add anything to it or delete anything that's on it. I've tried to ...
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1answer
302 views

Unable to format my memory card/SD - error -69877 couldn't open device

I can't seem to able to format my PNY 32 GB SD card When I go to Disk Utility and try to erase it gives me error: Unmounting disk, Couldn't modify partition map and operation failed I successfully ...
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99 views

MAC UNABLE TO FORMAT TO APFS [duplicate]

I hate to spam and reopen old issues but this is urgent!! I am experiencing an identical problem to the one in: Unable to format internal drive as APFS on 2018 MacBook Pro My internal drive can ...
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2answers
134 views

How to reclaim all the space on a NAS RAID drive for us as a regular Mac drive

I have just upgraded several hard drives on our Synology, and now have 2 bare metal drives of smaller capacity (6TB) that I'd like to reuse on my Mac for other purposes. However I can't seem to get ...
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Can’t install macOS High Sierra after formating my HDD

After erasing my HDD with APFS format, I always get an error while installing macOS High Sierra. Error is caused because of APFS format. Now I can’t erase it using a different format... how can I ...
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1answer
193 views

format/Erase Equivalence Disk Utility and Terminal Command diskutil

What is the diskutil equivalence from Disk Utility of Format/Erase with Format MS-DOS(FAT) and Scheme GUID Partition Map. Format/Erase with Format MS-DOS(FAT) and Scheme Master Boot Record. In other ...
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1answer
59 views

How do I make 1 empty partition out of an external USB disk?

I made a mistake with dd and now my external USB disk looks as follows: $ diskutil list (... output ...) /dev/disk2 (external, physical): #: TYPE NAME ...
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440 views

Re-install MacOS with bootable USB

I'm trying to reinstall MacOS Catalina on a second hand Macbook Pro 2019. I cannot access Disk Utils in any way specified on the web. Only option that is available is Internet Recovery and I face an "...
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0answers
199 views

SSD not recognised by MacBook Air

I changed the motherboard of a MacBook Air A1465 because the previous one was faulty and the Mac didn't even start. Now the machine starts but when I try to install, neither the macOS installer app ...
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0answers
167 views

How can I completely erase a “read only” USB drive?

I have a USB drive that appears to be stuck as a "read-only" device. I have tried to format it as MS-DOS (FAT) Master Boot Record using Disk Utility, but I get the following I also have followed all ...
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0answers
34 views

Is there a way to format a MacBook hard drive from Windows?

I have an old mid-2008 MacBook, used to work fine until one day I decided to install CloudReady on it, it worked like garbage. I tried all the cmd+[whatever] options to get a boot menu and rollback ...
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3answers
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Will a buyer be able to recover my files if I format my mac HD and sell it?

If I follow the standard procedure for logging out and formatting my Mac before selling it, as described in https://support.apple.com/en-us/HT201065 - Will the buyer be able to recover my files with ...

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