Same issue as related in this thread but I already did the following: - Re-created a new GPT (GUID) partition table (using GParted, Ubuntu) - Created an HFS+ partition specifically for my MacOS - Re-created an EFI system partition of +500Mb And yet, when using the Internet Recovery Mode, two things happen: 1. The wrong MacOS is being downloaded (Mac OS X Yosemite, instead of Monterrey) 2. The HFS+ partition created does not show. ----------------- **What did I miss?** A possible solution would be to reformat the hard drive using Diskutil (Terminal, Recovery Mode) but no idea how to target the correct hard drive. ----------------- This what my partition table looks like from GParted: And this is what my Disk Utility shows on Recovery Mode: ----------------- Things to take into consideration: - I used to have an APFS hard drive before. But that must have been replaced by the HFS+ partition. - I did not use FileVault or encrypted the disk (have had a lot of problems in using that).

I have a USB flash drive and can format the stick, but when I try to mount it, the following error occurs: Screenshot of an error message in German that reads: > 'Mounting of 'Ohne Titel' has failed' The error is in German, it means "Mounting of "Ohne Titel" has failed. (com.apple.DiskManagement.disenter -Error -119930873)" I can't find any solutions online and don't know what to do. There is no data on this stick so I can easily format it.

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 be a time machine partition or option. Which partition should I format? Can I clear them all and start from scratch? If someone could show me how to get this issue resolved so I can use my laptop again that’d be great.

Not sure if I need to re-format and re-install again. Is it normal to see so many Mac HD, and should I try to remove the extra ones? Had some HD issue where somehow there was no space left and thus there was nothing to do but to clean install everything. Now it seems there are multiple Mac HD / Mac HD - Data, with different avail space, as shown:

~ % diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI ⁨EFI⁩                     314.6 MB   disk0s1
   2:                 Apple_APFS ⁨Container disk1⁩         850.0 GB   disk0s2
   3:       Microsoft Basic Data ⁨BOOTCAMP⁩                150.2 GB   disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +850.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume ⁨Macintosh HD - Data⁩     688.1 KB   disk1s1
   2:                APFS Volume ⁨Preboot⁩                 271.6 MB   disk1s2
   3:                APFS Volume ⁨Recovery⁩                1.1 GB     disk1s3
   4:                APFS Volume ⁨VM⁩                      1.1 GB     disk1s4
   5:                APFS Volume ⁨Macintosh HD - Data⁩     66.9 GB    disk1s5
   6:                APFS Volume ⁨Macintosh HD⁩            15.7 GB    disk1s7
   7:              APFS Snapshot ⁨com.apple.os.update-...⁩ 15.7 GB    disk1s7s1

/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        +455.4 MB   disk2
   1:        Apple_partition_map ⁨⁩                        32.3 KB    disk2s1
   2:                  Apple_HFS ⁨Google Chrome⁩           455.3 MB   disk2s2
                    (free space)                         13.0 GB    -

/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +401.1 MB   disk5
   1:                  Apple_HFS ⁨Unity Hub 3.0.1⁩         401.0 MB   disk5s1

/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.4 GB     disk6
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk6s1
   2:                  Apple_HFS ⁨Visual Studio⁩           2.1 GB     disk6s2

I am trying to format my USB flash in ExFAT format to make it work on both Mac and Win devices. But I am unable to format my USB flash because I am getting an error when trying to format it via diskutil. 1) Check our external device in disks list: 2) Format: According to the internet answers, I have tried to boot in safe mode and format USB flash then - but also got 'could not open device' error. Can somebody help me with this? P.S. Result of execution command from the question comment:

I am trying to format a USB drive, however I am faced with the following error: sh-3.2# diskutil unmountDisk force /dev/disk3 Forced unmount of all volumes on disk3 was successful sh-3.2# diskutil eraseDisk JHFS+ MacOS /dev/disk3 Started erase on disk3 Unmounting disk Error: -69760: Unable to write to the last block of the device sh-3.2# lsof | grep disk3 sh-3.2# Could someone help me to figure out what to do to resolve this issue? EDIT 2: # fdisk -f boothfs /dev/disk3 Disk: /dev/disk3 geometry: 121601/255/63 [1953525168 sectors] Signature: 0x0 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: 00 0 0 0 - 0 0 0 [ 0 - 0] unused 2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused 3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused 4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused sh-3.2# fdisk -i -a boothfs /dev/disk3 fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory ----------------------------------------------------- ------ ATTENTION - UPDATING MASTER BOOT RECORD ------ ----------------------------------------------------- Do you wish to write new MBR and partition table? [n] y sh-3.2# sh-3.2# diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 120.5 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +120.1 GB disk1 Logical Volume on disk0s2 7887C476-CBE0-4D10-B95A-5C79F83B20D7 Unencrypted /dev/disk3 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: *1.0 TB disk3 sh-3.2# EDIT 3 **(In CentOS 7)** # mkfs.ext4 /dev/sdc mke2fs 1.42.9 (28-Dec-2013) /dev/sdc is entire device, not just one partition! Proceed anyway? (y,n) y Warning: could not erase sector 2: Attempt to write block to filesystem resulted in short write Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 61054976 inodes, 244190646 blocks 12209532 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2392850432 7453 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848 Allocating group tables: done Warning: could not read block 0: Attempt to read block from filesystem resulted in short read Warning: could not erase sector 0: Attempt to write block to filesystem resulted in short write Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: 0/7453 Warning, had trouble writing out superblocks.

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 make the new copy bootable? I'd like to make a new backup copy of the USB rescue device for my MBA, preferably on a much larger flash drive with room for a backup of some of my working directories. Added: And is it possible to make, not just a rescue drive, but a bootable USB drive that will boot a fully updated version of the OS (say 10.6.8 or later)? If so how on a MacBook Air 11, and how big a USB stick will this require?

How do I format a disk partition from the command line on Mac OS X? In case someone wonders why: because for some people Disk Utility fails.

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 left the factory, at least in the software side. Like SMC and NVRAM reset etc. Or deleting the disk resets the things that I mentioned? If not, when should I reset them? After deleting the disk and before installing the High Sierra (I will downgrade from Mojave to High Sierra) or after installing the High Sierra? And are there any other things that can be reset like SMC and NVRAM? If there are, please mention them.

I have cancelled the mac installation due to pkdownload error 8, which I look up on google and found out that this error due to my unstable internet connection. So I was wondering should I erase the disk and start over or can I just safely select reinstall mac os big sur from recovery mode, would this option continue from last attempt? Thanks! Device is Macbook Air M1, 2020

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. That always made backups and moving data to new machines simple for me. This time I struggled to create that same arrangement, but it proved too difficult. I sat down recently to attempt to resolve the mess I created. It appears I had created a 1.05 TB and a .95 TB partition on the SSD. The 1.05 TB partition contained a "container" that contained my OS and data in a couple of "volumes". The remaining .95 TB partition of the SSD was simply a wasteland. Over the last couple of days I have made numerous attempts to erase/reformat any or all of the SSD but the Disk Utility simply will not allow any of that (erase is ghosted). I have tried changing the size of the first partition, but Disk Utility will not allow that either. Next I tried a few things with diskutil in terminal but do not seem to be making any progress there either. Command + R and Command + Option + R did not work for me because Disk Utility there only shows disk0/OS X Base System, neither of which can be erased, and Reinstall OS X cannot find any drive at all for the install. So, in summary, help! If I do a diskutil list in Terminal I see disk0 thru disk13... and that can't be right. I want to reformat and start over but nothing seems to get me there. Currently there is no important data on this machine. Oh, laptop still works fine, I just can't live with system and data on same partition. Some of my symptoms sound similar to Redrighthand's "MacBook-pro Internal PCIe Samsung 512g SSD no longer recognized on MBP (mid 2015 15" A1398)" . Thanks in advance for any help. First screenshot below of diskutil list taken in recovery mode, second screenshot taken of terminal after normal boot. Last two screenshots are of Disk Utility...

I am about to reformat a PNY 128gb microSD card that I have been unsuccessfully trying to erase by using Disk Utility (Monterey OS), but this time I will be using an older Android device. The card became unreadable after I used to extend the hard drive space of an Android 13 tablet. I tried Windows 10 and Android 13 to reformat the card, but they do not even recognize the drive. I do not have an older Android device at the moment, but I would appreciate if anyone that can reproduce or has had this error and would be kind enough to report.

This is the output in Disk Utility: > Disk Utility cannot modify this disk because it contains CoreStorage > physical volumes. Use command line distil instead. > > The selected partition won't be changed. How do I remove the partition? It's completely empty now and I've cleared it by formatting it but I want to completely remove the partition and merge the free space back into the bigger partition. I've tried doing this but it doesn't work in Terminal: diskutil eraseVolume format name device diskutil eraseVolume HFS+ awer disk1s4 It didn't work: Started erase on disk1s4 asdf Unmounting disk Error: -69879: Couldn't open disk

I'm new to OS Development, and I want to format a 1.44MB floppy image with the FAT12 file system. I created the disk using dd if=/dev/zero of= bs=512 count=2880, so it's just a raw image filled with zeros. Next, I wanted to create the file system. The guy in the tutorial used mkfs.fat12, but I'm working on MacOS. The only command I've found for formatting disks there is newfs_msdos -f 2880 -F 12 . But that commands just prints an error: newfs_msdos: Inappropriate ioctl for device: build/disk2.img: Cannot get partition offset I've also found diskutil eraseDisk, but that only works for a mounted device, not for disk images, and I can't mount a disk image if it has no working file system. I'd be thankful if someone knows a command that works for floppy images, or if someone can tell me what triggered this error and how I can avoid it. How can I tell the command that there is no partitions or offsets, and I just want to format the whole disk?

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 forensic expert cannot recover anything?

I have a Macbook and bought an internal 20TB hard drive that I am using through a docking station. I am wondering if I should format the drive as Mac OS Extended or APFS, if for example one day the drive stops working and I need to contact a data recovery service? Which would lead to better recovery? Thanks

I want to format everything. Is it possible without opening the device ? It's a MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports) running Ventura 13.3.1 (a) (22E772610a)

Deleting file on a usb key has become impossible since I try to export photo from an Iphone to an external USB key with the application "photos". The Usb key continue to work properly when reading it. (We can still open anything on the key). But add file, rename file or deleting file is impossible. I try all what google have to purpose : - Right click on read information. As you can see "*partage et permissions*"("*sharing and permissions*") can not be modify. "*Lecture seulement*" means "*read only*". - I try to use disk utility to try running S.O.S, also to try reformating disk. Here is the error I get :

Running S.O.S. on "NO NAME" (disk2s1)

Repairing file system.
The volume is already unmounted.
Running fsck_msdos -y /dev/rdisk2s1
** /dev/rdisk2s1 (NO WRITE)

** Phase 1 - Preparing FAT

** Phase 2 - Checking Directories

** Phase 3 - Checking for Orphan Clusters

Found orphan cluster(s)

Fix? no

Found 43 orphaned clusters

Free space in FSInfo block (1065976) not correct (1065974)

Fix? no

892 files, 34111168 KiB free (1065974 clusters)

File system check exit code is 8.
Reverting to original state: unmounted.
File system check or repair failed: (-69845)

The operation has failed...

- trying to use command line to change right

~ ls -la /Volumes/NO\ NAME/* 
-rwxrwxrwx@ 1 boris  staff   2283166 14 avr 20:36 IMG_0417.jpeg
...
~ sudo chmod -v u+rw  /Volumes/NO\ NAME/*
~ ls -la /Volumes/NO\ NAME/* 
-rwxrwxrwx@ 1 boris  staff   2283166 14 avr 20:36 IMG_0417.jpeg
...
~ sudo rm -rf /Volumes/NO\ NAME/* 
rm: /Volumes/NO NAME/IMG_0200.jpeg: Read-only file system
...

Notice that is strange because I can't rename **IMG_0200.jpeg** even if there are

-rwxrwxrwx@

- Here is what saying testdisk : - I also try on windows to use diskpart to reformat. The problem was the same than testdisk - Obviously propiety file didn't work too. Hope someone can help me, and don't use photos application to export yours images...

I recently purchased a Sandisk Extreme SSD to work with Mac and Android. 1. Is it possible to create 2 exFAT partitions of the drive? (Currently, I managed to do a combination of exFAT and HFS/Mac OS Extended (Journaled)) 2. Is it possible to change the allocation size using Disk Utility on Mac? Running the command:

diskutil info /Volumes/PartitionName/ | grep "Block Size"

gives the default sector size as:

# For exFAT partition
Device Block Size:        512 Bytes
Allocation Block Size:    131072 Bytes

# For Mac OS Extended partition
Device Block Size:        512 Bytes
Allocation Block Size:    4096 Bytes

However, I didn't get the option to decide the allocation block size while partitioning/erasing the disk on Mac. Am I missing something? Also, what should be the appropriate allocation size considering I am planning to store photos, documents and backup data? For eg. this [review](https://www.amazon.com/gp/customer-reviews/R2P6K0OF0PX858?ASIN=B078STRHBX#R2P6K0OF0PX858) suggests formatting the hard disk before using with appropriate allocation size on Windows (like 128kb). If we follow the answer provided [here](https://apple.stackexchange.com/a/213888/395465) , could you please explain how to change allocation size (instead of device block size) with newfs_exfat Platform: macOS High Sierra Version 10.13.6

So my external SSD (1TB Samsung 970 evo plus in an Orico TB3 housing) died. I unmounted it but probably didn't wait long enough and unplugged the drive before completing the unmounting procedure. So the partition map got damaged and I couldn't mount it. I managed to save all data on it with Easeus, but I'm unable to format it. In Disk Utility it only sees the container. Things I tried: Disk Utility: I tried first aid and formatting, they failed (for formatting: 69623), both in normal mode and recovery mode. Terminal: I tried to force unmount (diskutil unmountDisk force /dev/disk0), it failed. Single user: I tried unmounting and it says: not currently mounted. Formatting on a Windows machine: it doesn't even recognize it at all. Could I theoretically try to format the disk in terminal without ejecting it first? Weird thing is that in single user mode, when the disk is plugged in, there's a disk0, disk0s1, disk0s2 which I think is this external drive (the internal is supposed to be disk1 with more partitions), but when unplug it and replug it, there's still a disk0, disk0s1, disk0s2, AND a disk2 and a disk3. Maybe the disk0 is the one that I should try to unmount because it's stuck? diskutil info says:

Identifier:         disk0
   Device Node:               /dev/disk0
   Whole:                     Yes
   Part of Whole:             disk0
   Device / Media Name:       Samsung SSD 970 EVO Plus 1TB

   Volume Name:               Not applicable (no file system)
   Mounted:                   Not applicable (no file system)
   File System:               None

   Content (IOContent):       GUID_partition_scheme
   OS Can Be Installed:       No
   Media Type:                Általános
   Protocol:                  PCI-Express
   SMART Status:              Verified

   Disk Size:                 1.0 TB (1000204886016 Bytes) (exactly 1953525168 512-Byte-Units)
   Device Block Size:         512 Bytes

   Media OS Use Only:         No
   Media Read-Only:           No
   Volume Read-Only:          Not applicable (no file system)

   Device Location:           External
   Removable Media:           Fixed

   Solid State:               Yes
   Virtual:                   No
   Hardware AES Support:      No

I'm not a computer scientist or anything, all I "know" is from reading stuff on google. Any help appreciated!