Объясните мне вывод fsck_hfs

Я пытаюсь проверить внешний жесткий диск USB 3.5 "на наличие поврежденных секторов и исправить их, если это возможно.

$ sudo fsck_hfs -fy -S /dev/disk2 

Дает следующий вывод:

** /dev/rdisk2 (NO WRITE) Scanning entire disk for bad blocks Executing fsck_hfs (version hfs-285). volumeType is 0 0000: 0000 0000 0000 0000 0000 0000 0000 0000 |................| . . . 01b0: 0000 0000 0000 0000 0000 0000 0000 00fe |................| 01c0: ffff eefe ffff 0100 0000 2f7b a8ae 0000 |................| 01d0: 0000 0000 0000 0000 0000 0000 0000 0000 |................| . . . 01f0: 0000 0000 0000 0000 0000 0000 0000 55aa |..............U.| block 8509328: *** NO MATCH *** block 8509329: *** NO MATCH *** block 8509330: *** NO MATCH *** block 8509331: *** NO MATCH *** block 8509332: *** NO MATCH *** block 8509333: *** NO MATCH *** block 8509334: *** NO MATCH *** block 8509335: *** NO MATCH *** block 2305765384: *** NO MATCH *** block 2305765385: *** NO MATCH *** block 2305765386: *** NO MATCH *** block 2305765387: *** NO MATCH *** block 2305765388: *** NO MATCH *** block 2305765389: *** NO MATCH *** block 2305765390: *** NO MATCH *** block 2305765391: *** NO MATCH *** block 2305765472: *** NO MATCH *** block 2305765473: *** NO MATCH *** block 2305765474: *** NO MATCH *** block 2305765475: *** NO MATCH *** block 2305765476: *** NO MATCH *** block 2305765477: *** NO MATCH *** block 2305765478: *** NO MATCH *** block 2305765479: *** NO MATCH *** block 2305765480: *** NO MATCH *** block 2305765481: *** NO MATCH *** block 2305765482: *** NO MATCH *** block 2305765483: *** NO MATCH *** block 2305765496: *** NO MATCH *** block 2305765497: *** NO MATCH *** block 2305765498: *** NO MATCH *** block 2305765499: *** NO MATCH *** block 2305765500: *** NO MATCH *** block 2305765501: *** NO MATCH *** block 2305765502: *** NO MATCH *** block 2305765503: *** NO MATCH *** block 2305765528: *** NO MATCH *** block 2305765529: *** NO MATCH *** block 2305765530: *** NO MATCH *** block 2305765531: *** NO MATCH *** block 2305765532: *** NO MATCH *** 

Это хорошо или плохо? Как понять этот вывод?

ОБНОВИТЬ:

Найдено здесь: https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man8/fsck_hfs.8.html

EXIT VALUES fsck_hfs indicates some status by exit value. The current list of exit status results is: 0 No errors found, or successfully repaired. 3 A quick-check (the -n option) found a dirty filesystem; no repairs were made. 4 During boot, the root filesystem was found to be dirty; repairs were made, and the filesystem was remounted. The system should be rebooted. 8 A corrupt filesystem was found during a check, or repairs did not succeed. 47 A major error was found with -E. 

Похоже, мой жесткий диск в порядке:

volumeType is 0 

Но я хочу понять другие выходные строки