- MAC DISK UTILITY PARTITION SCHEME HOW TO
- MAC DISK UTILITY PARTITION SCHEME FREE
- MAC DISK UTILITY PARTITION SCHEME MAC
The size of the main volume can be determined by the first (corrupted & old) entry of the second GPT table: (3000592961536/512)=5860533128 is its block number. Here it's obvious that your disk contains a 300 MiB EFI and probably 4096 bytes of unallocated disk space: (314598400-1024)/512=614448 (=Start block main volume) 61=614400 (=size of EFI) Please stop here and add a comment.įirst rebuild the EFI entry with: sudo gpt add -b 40 -i 1 -s 614400 -t C12A7328-F81F-11D2-BA4B-00A0C93EC93B /dev/disk6ĭepending on the size of the disk and the system version differently sized EFI volumes are built if partitioned with Disk Utility: either one with the size 200 MiB or one with 300 MiB. You have a disk & disk controller which report a logical block size of 4096 Bytes. You have a disk & disk controller which report a logical block size of 512 Bytes. If the gpt shows: start size index contents You may also use sudo gpt -r show /dev/disk6 Reassure yourself that the device block size still is 512 Bytes Overwrite the first 40 blocks: sudo dd if=/dev/zero of=/dev/disk6 bs=512 count=40Ĭreate a new gpt: sudo gpt create /dev/disk6Ĭheck the disk info with: diskutil info /dev/disk6 Unmount the disk: diskutil umountDisk disk6 Get the disk identifier of your external 3 TB drive diskutil listīelow I assume the disk identifier is disk6 Added a screen shot of offset 8192 based on the comments. Here are screen shots of the first HFSJ partition and the EFI System Partition. That also shows the name that the drive had, "Rosie". I was also able to find a section labeled EFI System Partition at offset 3000592961536. I'm not sure what to make of those, if anything. It had found a couple thousand at that point. I used the Find All search in wxHe圎ditor and stopped after a few minutes. Those start at 360424448 and are spaced 32768 apart. However, if I keep searching for occurrences of HFSJ, I find a lot of them that look exactly the same and with a lot of zero space around them, like the first one. So I searched starting from the beginning of the drive and found the first occurrence at offset 314598400. I started looking for the HFSJ string starting at an offset of 409642, as suggested in other answers, but didn't find it near there. Here is a screen shot of the first part of the drive in wxHe圎ditor. Gdisk /dev/disk6 GPT fdisk (gdisk) version 1.0.1 Gpt recover /dev/disk6 gpt recover: /dev/disk6: no primary or secondary GPT headers, can't recover Read-Only Volume: Not applicable (no file system)įdisk /dev/disk6 Disk: /dev/disk6 geometry: 97451/255/63
MAC DISK UTILITY PARTITION SCHEME FREE
Volume Free Space: Not applicable (no file system) Volume Name: Not applicable (no file system)Ĭontent (IOContent): FDisk_partition_scheme Here is the information I've collected from the drive.ĭiskutil list /dev/disk6 /dev/disk6 (external, physical):ĭiskutil info /dev/disk6 Device Identifier: disk6 I can't think of any specific use or event that may have caused the change. I'm sure it was originally the typical default of GUID Partition Map formatted as OS X Extended (Journaled). On investigating with Disk Utility, it shows as having a partition type of FDisk_partition_scheme.
The drive worked normally for a long time but then failed to be recognized recently. It has not been used with Bootcamp or on any non-Mac computer. I can't say for sure it never had a system installed, but I don't think so. The drive was not bootable and did not have a system installed so I'm assuming it would not have a recovery partition either. The drive was set up with a single partition.
MAC DISK UTILITY PARTITION SCHEME MAC
I have a 3TB Toshiba drive in a USB enclosure being used on a Mac with OS X El Capitain 10.11.3.
MAC DISK UTILITY PARTITION SCHEME HOW TO
My situation seems very similar to how to fix GUID hard drive corrupted to MBR but with enough differences that I haven't been able to put together a confident solution.
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