前言
我有一台Mac，裝有OS X和Windows兩系統，因Windows和OS X都能讀寫exFAT分區，
故若在Machintosh HD和Windows HD之間開辟一個exFAT分區，可以作為共享文件區。
我在OS X中用磁盤工具對Machintosh HD進行分區，在Machintosh HD和Windows HD之間開辟一個exFAT分區。
重啟啟動時，我按住了option，之后出現的啟動選項中沒有Windows。這因為剛才給磁盤分了區才導致的。
解決
重啟MAC ，按住COMMAND+R進入恢復模式，打開Terminal
csrutil disable #關閉rootless
修改完，重啟MAC，打開終端
sudo fdisk -e /dev/disk0
yanghaodeMacBook-Pro:~ yanghao$ sudo fdisk -e /dev/disk0 Password: fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory Enter 'help' for information fdisk: 1> p Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors] Offset: 0 Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID> 2: AC 1023 254 63 - 1023 254 63 [ 409640 - 183869624] <Unknown ID> 3: AB 1023 254 63 - 1023 254 63 [ 184279264 - 1269536] Darwin Boot *4: 07 1023 254 63 - 1023 254 63 [ 185548800 - 304685056] HPFS/QNX/AUX fdisk: 1>
修改分區表
fdisk: 1> p Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors] Offset: 0 Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID> 2: AC 1023 254 63 - 1023 254 63 [ 409640 - 183869624] <Unknown ID> 3: AB 1023 254 63 - 1023 254 63 [ 184279264 - 1269536] Darwin Boot *4: 07 1023 254 63 - 1023 254 63 [ 185548800 - 304685056] HPFS/QNX/AUX fdisk: 1> setpid 4 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ *4: 07 1023 254 63 - 1023 254 63 [ 185548800 - 304685056] HPFS/QNX/AUX Partition id ('0' to disable) [0 - FF]: [7] (? for help) 07 fdisk: 1> flag 4 Partition 4 marked active. fdisk:*1> p Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors] Offset: 0 Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID> 2: AC 1023 254 63 - 1023 254 63 [ 409640 - 183869624] <Unknown ID> 3: AB 1023 254 63 - 1023 254 63 [ 184279264 - 1269536] Darwin Boot *4: 07 1023 254 63 - 1023 254 63 [ 185548800 - 304685056] HPFS/QNX/AUX fdisk:*1> write Device could not be accessed exclusively. A reboot will be needed for changes to take effect. OK? [n] y Writing MBR at offset 0.
重啟電腦按OPTION
