How to use TestDisk to recover lost partition
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Hi I just downloaded Test Disk because I can't boot into mac os. When I went to disk utility in windows, It said the partition was unallocated space. I did not format or delete any of the partitions but just randomly disappeared. In the mac installer, disk utility also could not detect the disk. After looking for ways to recovering lost partitions I ended up here and I am currently running test disk to analyze the mac drive. Could you guys give me advice on how to solve this problem because this is the first time I have used test disk.
Hi, thank you for the fast reply. I checked out the testdisk pdf and it was helpful. However, when I ran the analysis of the disk, It detected the problem but said that the "write" method was not supported for mac drives. Here is the log
"HFS+ blocksize=4096 + Backup, 62 GB / 58 GiB" is the partition that was lost. I cannot access it in any way and windows recognizes it as unallocated space. A normal hfs partition appears as "Healthy" with no disk format listed. In my screenshot attached, The 18gb partition is a normally working mac drive and the one saying "unallocated space" is the lost one. I hope you can tell me the solution for repairing the drive.
Code: Select all
Mon Jan 16 23:19:00 2017 Command line: TestDisk TestDisk 7.0, Data Recovery Utility, April 2015 Christophe GRENIER <email@example.com> http://www.cgsecurity.org OS: Windows 7 (7601) SP1 Compiler: GCC 4.9, MinGW 3.11 Compilation date: Apr 18 2015 13:02:07 ext2fs lib: none, ntfs lib: 10:0:0, reiserfs lib: none, ewf lib: 20120504, curses lib: pdcurses build 3401 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive0)=500107862016 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive1)=164696555520 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive2)=126035288064 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive3)=2020872192 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive4)=8004304896 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\C:)=126032543744 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\D:)=76823337472 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\E:)=437085274112 filewin32_getfilesize(\\.\F:) GetFileSize err Incorrect function. filewin32_setfilepointer(\\.\F:) SetFilePointer err Incorrect function. Warning: can't get size for \\.\F: disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\G:)=5074965504 disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\K:)=2020872192 Hard disk list Disk \\.\PhysicalDrive0 - 500 GB / 465 GiB - CHS 60801 255 63, sector size=512 Disk \\.\PhysicalDrive1 - 164 GB / 153 GiB - CHS 20023 255 63, sector size=512 Disk \\.\PhysicalDrive2 - 126 GB / 117 GiB - CHS 15322 255 63, sector size=512 Disk \\.\PhysicalDrive3 - 2020 MB / 1927 MiB - CHS 245 255 63, sector size=512 Disk \\.\PhysicalDrive4 - 8004 MB / 7633 MiB - CHS 973 255 63, sector size=512 Drive C: - 126 GB / 117 GiB - CHS 15322 255 63, sector size=512 Drive D: - 76 GB / 71 GiB - CHS 9339 255 63, sector size=512 Drive E: - 437 GB / 407 GiB - CHS 53139 255 63, sector size=512 Drive G: - 5074 MB / 4839 MiB - CHS 616 255 63, sector size=512 Partition table type (auto): Intel Disk \\.\PhysicalDrive1 - 164 GB / 153 GiB Partition table type: Mac Analyse Disk \\.\PhysicalDrive1 - 164 GB / 153 GiB - CHS 20023 255 63 Current partition structure: Bad MAC partition, invalid block0 signature read_part_mac: bad DPME signature search_part() Disk \\.\PhysicalDrive1 - 164 GB / 153 GiB - CHS 20023 255 63 NTFS at 616/254/63 filesystem size 9912042 sectors_per_cluster 8 mft_lcn 262144 mftmirr_lcn 2 clusters_per_mft_record -10 clusters_per_index_record 1 Unknown 9912104 19824145 9912042 NTFS, blocksize=4096, 5074 MB / 4839 MiB Partition not added. check_FAT: Bad number of sectors per cluster HFS+ magic value at 9957/29/57 HFS+ magic value at 9957/29/57 part_size 38813696 HFS 159961088 198774783 38813696 HFS+ blocksize=4096 + Backup, 19 GB / 18 GiB HFS+ magic value at 12373/40/20 HFS+ magic value at 12373/40/20 part_size 122894336 HFS 198774784 321669119 122894336 HFS+ blocksize=4096 + Backup, 62 GB / 58 GiB file_win32_pread(96,3,buffer,321672958(20023/54/62)) read err: read after end of file file_win32_pread(96,8,buffer,321672959(20023/54/63)) read err: read after end of file Results P HFS 159961088 198774783 38813696 HFS+ blocksize=4096 + Backup, 19 GB / 18 GiB P HFS 198774784 321669119 122894336 HFS+ blocksize=4096 + Backup, 62 GB / 58 GiB interface_write() P HFS 159961088 198774783 38813696 P HFS 198774784 321669119 122894336 Function write_part_mac not implemented
Solved THANK YOU SO MUCH cgrenier!!! I made a mistake in which file system I chose. Instead of mac file system, I chose EFI GUID which was actually correct and was able to use the write function to fix the disk. Although it still appears unallocated in disk manager, I can now boot into macos and access my files. Is there anything I should do to prevent this problem from occuring again?
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