Questions tagged [guid]

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1 answer
540 views

Recovering "Damaged" Files on External USB Drive: GUID, HFS (can not open files)

I had some files on an old thumb-drive, and recently I was going through and discovered that all/most of the files were no longer readable by any of my macs. I seam to remember having similar problems ...
2 votes
1 answer
71 views

Troubleshooting GUID partition "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFF" [duplicate]

Running a Mac Pro 2013 with macOS Catalina. Looking to change the GUID type from FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF to 7C3457EF-0000-11AA-AA11-00306543ECAC. I've been browsing through various ...
0 votes
2 answers
523 views

How can I do a GPT (Guid Partition Table) sector raw backup with `dd` like in a UNIX/Linux-MBR fashion?

I want to "raw copy" with dd the critical GPT (~ Guid Partition Scheme) bytes of my computer's main hard drive, to an arbitrary file. I tried to do the equivalent MBR/Unix/Linux in my Mac (...
2 votes
2 answers
860 views

Inaccessible APFS Partition - no gpt scheme

In an attempt to recover a different external drive altogether, my drive "Libraries" was compromised. Just for it being connected at the same time. I'll be sure to disconnect drives I'm not ...
13 votes
2 answers
36k views

How to fix broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro with retina, Yosemite and 500GB hard drive. I tried to install Windows using Bootcamp and accidentally deleted a partition, now my Mac cannot boot anymore. This is the output from ...
1 vote
0 answers
218 views

Tried to install Kali Linux and now I can't access macOS anymore

It has been 3 days, I was trying to recover it but now I am out of options. I've tried installing Kali Linux on my Mac as a dual boot with a Linux partition of 20.5 GB inside my 500GB SSD and 1GB of ...
0 votes
2 answers
447 views

Can I run a disc image of a cloned Tiger or Leopard PPC drive on a modern Intel Mac via virtualization software?

I have a PowerMac G5 PPC running Tiger and an old, white, Santa Rosa MacBook running Leopard. If I create cloned disc images of these OS drives, will I be able to run them in VMWare Fusion/Parallels/...
1 vote
1 answer
1k views

Error: -69519 when resizing partition of apfs container scheme

I am trying to resize the partition disk0s2 in my Mac. My diskutil list shows: /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: ...
2 votes
1 answer
882 views

How to fix FDISK_partition scheme after repartitioning a larger space for bootcamp

I have a Mac that is running Mojave, and yesterday I was trying to repartition the disk so I could get more space on my Windows partition for bootcamp. In the process, the Windows folder only appeared ...
0 votes
0 answers
560 views

How do i repair a corrupt drive without losing data

I was copying data from an old ds112 Synology hard drive to a new install on a ds112 due to board failure of the other one. I have the old drive in a caddy and was successfully copying data when I ...
5 votes
1 answer
2k views

I can no longer boot into macOS after resizing my bootcamp partition in EaseUS

I tried to enlarge the bootcamp windows 10 partition by 17gb. I went to disk utility on my mac, resized the mac's partition to smaller leaving 17-18gb of free space, then booted up the windows in ...
0 votes
0 answers
161 views

Restore a partition on an external drive after enclosure failure

I had a very freak electrical accident with my iMac 5K a few weeks ago. One of my external drives (my backup drive) shorted out and would no longer mount. I decided to buy an 3.5" enclosure as I ...
0 votes
0 answers
80 views

Partition type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, drive unmountable How do I fix this?

I started having this issue when I tried to swap my sshd for an ssd. My caddy was broken so I tired booting into bootcamp to run disk cloning software. (Seagate backup time machine disk failed on me....
0 votes
0 answers
358 views

Is it possible to repair a Mac external hard drive's partition table, without access to a Mac?

I tried to create an NTFS partition on an HFS+ formatted Mac external hard drive, from within Windows. This hosed the GUID table. In order to try to recover the files, I had to turn off journaling, ...
1 vote
1 answer
253 views

Cant install bootcamp in MBR after internal SSD upgrade

I upgraded internal kSSD on my mac (MBP-2013) via Carbon Copy Cloner. OSX loads fine, but for some reason I cannot boot into Windows that I have installed on external USB in MBR mode. Prior to ...
1 vote
0 answers
65 views

How can I recover my external drive's partition table?

I have an old WD MyBook Ext Drive and I couldn't access the greyed out sub-partition in DiskUtility. I was trying to fix it with various Terminal commands relating to GPT and somehow I managed to mess ...
1 vote
0 answers
508 views

EFI missing, Question folder appears, Mac SSD appears and disappears, what do I do?

Setup Macbook Pro retina 13 A1502, SSD 128Gb Running Yosemite, but currently doing the update for high sierra. Problem: Question marked folder appear after I left it for 2 days, battery run out (left ...
1 vote
1 answer
531 views

Making Conflicting UIDs across a LAN of MacOS and Linux hosts Consistent

I have an expanding network and while I have the long term goal of eventually implementing Active Directory hosted on a QNAP NAS. However, in the meantime I have the issue of where my MacOS machines ...
1 vote
1 answer
2k views

How to fix CoreStorage not mounting? Broken GPT, GUID, volume etc?

I have an external hard drive with two partitions, each one formatted as "OS X Extended (Journaled, Encrypted)". The second partition mounts and asks for a password, but the first one does not. The ...
1 vote
1 answer
2k views

MacOS partition shows up as FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF (Mojave)

I suspect this this may be a duplicate, but I'm not sure what I should do considering almost everyone else has another macOS version or other partition size and I'm not sure how to generalize another ...
1 vote
1 answer
708 views

How to recover trashed GUID partition table?

I did something stupid. I ran (something like) diskutil partitionDisk /dev/disk2 GPT HFS+ newdisk against the wrong disk. It was one of those moments where you realize what you've done, as you're ...
5 votes
1 answer
14k views

When is the GUID partition table (GPT) preferred over Apple partition map (APM) for external drives?

I have seagate external portable hard-drive 1 TB, and I will be using with following Mac's. 13" White MacBook (Intel Core 2 Duo) running Snow Leopard 13" MacBook Air (Intel Core i5) running Lion iMac ...
4 votes
0 answers
308 views

Recover data from external hard drive partition Mac OS X

A couple of weeks ago, I dropped my external drive while a program was writing data to it. The drive seems to spin up fine, without beeps/scratches. The drive also has EFI and Recovery partitions. One ...
27 votes
1 answer
57k views

How to choose GUID with High Sierra's Disk Utility?

Most often USB flash drives on the market are pre-partitioned under (Windows) Master Boot Record. Until El Capitan a special widget in Disk Utility made it possible to set the partition type to GUID. ...
6 votes
0 answers
4k views

Whats wrong if 'Invalid BS_jmpBoot in boot block: 000000'

I have a corrupted partition and upon trying to repair it with disk utility it gives the error Invalid BS_jmpBoot in boot block: 000000 Several postings on the internet describe this problem related ...
3 votes
0 answers
439 views

lost Mac OS X partition after resizing bootcamp

Recently I tried to resize my bootcamp partition. I first resized the Mac osx partition to a smaller one with diskutility and appended this space to the bootcamp partition from within windows 10 (with ...
1 vote
1 answer
919 views

Creating encrypted disk image passphrase in Keychain, and strange GUID account

When a user persists an encrypted disk (or disk image) passphrase in the Keychain (e.g via Disk Utility as shown here, https://apple.stackexchange.com/a/229309/5392 or when setting up an encrypted ...
2 votes
1 answer
1k views

Corrupted GUID partition table on secondary hard drive

I have a Hackintosh computer, with a secondary hard drive installed with a bunch of data on it. I was trying to partition off part of the secondary hard drive to install Windows so I could dual boot, ...
3 votes
1 answer
891 views

Recover Corrupt SSHD

I had an old 2011 13" MPB with a 250 GB Samsung Evo 840 SSD and, using the OWC expansion bay mod, a 1 TB Seagate SSHD. The SSD was the boot drive and the SSHD was just for Time Machine backups, file ...
2 votes
0 answers
437 views

Macbook can't read Macintosh HD

I use a late 2013 macbook pro 13 inch retina display. I tried formatting my internal ssd hard drive (macintosh HD) after it started freezing forever whenever I tried to log in. I tried all the ...
0 votes
1 answer
174 views

How to save data from broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro mid 2012 and 750GB hard drive. I tried to delete Windows partition on the hard disk and now I can't access my main Mac partition (disk index 2) anymore. It shows something like "...
1 vote
0 answers
55 views

External HD changed partition map

Apparently my external HD went crazy (I've been using it without problem for a long time) and decided to change partition scheme from GUID to FDisk (look at disk1) but my data remains as HFS+ (disk1s2)...
2 votes
0 answers
621 views

MBP SSD Deep Formatting Problem - Will Format as FAT32 but fails as HFS+

My MBP SSD crapped out the other day, I'm pretty sure it was user error (too full). I was able to run my emergency OS via external drive and collect my files, but had difficulty deleting them from my ...
1 vote
1 answer
713 views

Time machine: include external FAT drive

I am trying to backup an external FAT drive with time machine on a new WD HFS+ formatted hard drive, and I've read it is possible. However, I find it in the excluded list, and I cannot remove it ...
2 votes
1 answer
519 views

How to create a new partition on FileVault disk on MacOS

I have a 500GB disk on MacOS encrypted with FileVault 2. I have successfully resized the disk to 250GB. Now I want to create another partition to install another MacOS on the 250GB free-space of the ...
0 votes
1 answer
2k views

How do I install Windows on separate disk using GPT/EFI and BootCamp?

I have a Late 2012 27 inches iMac with an internal HDD (that has a Macintosh HD partition, an EFI partition and a Recovery partition) and an SSD. I installed Windows 10 on using BootCamp Assistant; ...
1 vote
1 answer
70 views

Unable to access neither Partition Layout nor Option tab in Partition tab on Disk Utility

I have a problem that I cannot select Option tab in Partition tab as shown in above screenshot. I wanted to convert my external hard disk to GUID partition table. Thank you in advance for your help.
4 votes
2 answers
20k views

Rebuild partition table on external HDD - not writable

I have an external hard drive formatted with 3 HFS+ partitions. To cut a long story short I had it connected to a Windows PC and accidentally started formatting the drive to NTFS. As soon as I ...
0 votes
1 answer
2k views

How do I roll back from Yosemite to Mountain Lion without Internet Recovery after erasing my hard disk?

I erased my MacBook Air hard drive - which came with Yosemite OS X - because I wanted to roll back to Mountain Lion (OS X 10.8), since Yosemite was giving me problems with my files from the previous ...
1 vote
1 answer
1k views

Why is a hard drive not readable anymore after removing it from the Mac?

I have a mid 2010 27" iMac. Until this evening it had an SSD (primary drive with OS X Mavericks installation on it) and a HDD as second drive. The HDD is a Western Digital I built into the iMac in ...
0 votes
1 answer
341 views

Time Machine Changed My External Hard Drive's to MBR and now I can't access it!

On Yosemite, I was using Bootcamp to install Windows on a part of my internal hard drive. When, bootcamp was finished (before booting into Windows), Time Machine popped up and asked me if I wanted to ...
1 vote
1 answer
5k views

HD accidentally reformatted to MBR, how to get back to GUID?

So in trying to create an MBR partition of my hard drive which I could then use to boot a solaris-derivative OS using rEFIt, I messed up. Rather than a hard drive with a primary GUID partition map ...
0 votes
1 answer
12k views

How to fix broken GPT, GUID and unmountable and without type volumes?

I have Macbook pro with mavericks and 512GB SSD i accidentally deleted a partition and suddenly my mac could not boot any more and after i tried to do something with disk utility this is gpt -r show ...
0 votes
1 answer
66 views

GUID partition scheme

If I try to change a partition scheme of a 4 partition HDD from Apple to GUID, iPartition warns me that 'system partition' will be erased. What does that mean? Thanks.
2 votes
0 answers
46 views

Recovering reformatted partition

I have an external drive that had a single HFS+ partition (GPT). It was accidentally formatted. How can I recover the lost partition? I "know" the old partition map which (coincidentally?) is the same ...