I definitely recommend to start with approach #1 if you can. Unfortunate for me, I had to go down the road of the 2nd approach.īut fortunate for you, because I can explain you here both approaches. HFS – the “oh f*ck” case: a more complex, technical solution.HFS+ Plus – best case: a simple and well supported solution.% diskutil listģ: > Apple_HFS <<<< 653.5 MB disk3s1s2īut for sure you can somehow teach macOS Catalina the ancient language of «HFS» – Apple’s own Hierarchical File System format – right?īringing back HFS support to macOS comes in 2 variations: If you think the volume is supported but damaged, try the "readOnly" optionīy inspecting the technical details of the disk lead me to a clue, that the old – in the meantime unsupported – Apple_HFS format may be the issue. 8 A corrupt filesystem was found during a check, or repairs did not succeed.So I wanted to backup an old DVD disc digitally in macOS Catalina, but to my surprise it was not mountable using Disk Utility – only showing the error: Could not mount ( error 49153)Īnd by using the following Terminal.app command it did not work either, not giving more clues about the underlaying error unfortunately: % diskutil mount disk3s1s2.4 During boot, the root filesystem was found to be dirty repairs were made, and theįilesystem was remounted.3 A quick-check (the -n option) found a dirty filesystem no repairs were made.0 No errors found, or successfully repaired.Total sectors for embedded volume = 0 0x00 ** The volume DATA was found corrupt and needs to be repaired.Īlternate VHB is at block 88769454 0x54a83ae Verify Status: VIStat = 0x8000, ABTStat = 0x0000 EBTStat = 0x0000 This is synonymous with -Rc.īecause of inconsistencies between the block device and the buffer cache, the raw device should alwaysĮxample: > sudo fsck_hfs -l -d -D 0x0033 -B ~/.profile /dev/disk0s8 Rebuilding btrees is not supported on HFS Standard volumes. The new btree file, and if fsck_hfs is able to traverse each of the nodes in the Requires free space on the file system for The blocks with errors to names, similar to the -B option. S scan the entire device looking for I/O errors. Sistency which would not impact such use is considered ``minor'' for this option. A ``majorĮrror'' is considered one which would impact using the volume in normal usage an incon. E exit (with a value of 47) if it encounters any major errors. y Always attempt to repair any damage that is found. Standard output describing whether the volume was clean or dirty. If the volume was not unmountedĬleanly, then the exit status will be non-zero. Was unmounted cleanly, then the exit status is 0. q Causes fsck_hfs to quickly check whether the volume was unmounted cleanly. If the number ends with a k,m or g -p Preen the specified file systems. Bigger size can result inīetter performance but can result in deadlock when used with -l. c size size of the cache used by fsck_hfs internally. Orphaned files and directories are moved to the lost+found directory (located at the root of the volume). m rwxrwxrwx permissions for the lost+foundĭirectory if it is created (suggest 700 ed). This makes it possible to checkĪ file system that is currently mounted, although no repairs can be made. implies -g -l Lock down the file system (not limit parallel check as in other versions of fsck> and perform a test-only check. x generate output strings in XML (plist) format. This option is used whenĪnother application with a graphical user interface (like Mac OS X Disk Utility) is g generate output strings in GUI format. Otherwise force check and repair journaled HFS+ file systems. f with -p force check of `clean' file systems, The size of a physical block is given with the -b option the default is 512 bytes per block. Subtract the block number of the start of the partition. The partition, For block numbers relative to the start of the device, The file contains decimal, octal (with leading 0) or hexadecimal (with leading 0x) physical block numbers, separated by white space, relative to the start of b bytes size of the physical blocks used by -B -B path Output the files containing the physical blocks listed in the file path. With no options check and attempt to fix the specified file systems. More serious problems are found, fsck_hfs does not try to fix them, indicates that it was not successful, and exits. Started by fsck(8) from /etc/rc.boot during bootįix common inconsistencies for file systems that were not unmounted cleanly. ** Checking non-journaled HFS Plus Volume. Using cacheBlockSize=32K cacheTotalBlock=32768 cacheSize=1048576K.Įxecuting fsck_hfs (version hfs-305.10.1). > sudo /sbin/fsck_hfs -d -D0x33 /dev/disk0s10 # check for inconsistencies onlyįsck_hfs # check if clean unmountįsck_hfs -p special. fsck_hfs File System check for HFS and HPFS+ (high performance file systems fsck_hfs -q special. Fsck: File System Check for High Performance files systems Mac OS X.
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