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Create a Fusion Drive with a Recovery Partition
It also depends on which version of the OS you're using to make the fusion drive AND the age of the Mac you're running. I don't know exactly if it is only in Mavericks of if Mountain Lion already supported this in the latest updates, but after creating a Fusion Drive the second hard drive actually contains a recovery partition. For example, this is my FD: $ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *256.1 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage 197.9 GB disk0s2 3: Apple_Boot Boot OS X 134.2 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI EFI 209.7 MB disk1s1 2: Apple_CoreStorage 892.0 GB disk1s2 3: Apple_Boot Boot OS X 650.0 MB disk1s3 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Mac OS X *1.1 TB disk2 *don't mind the disk size as there are windows partitions I removed from the listing But what you want to pay attention to is the size of both "Boot OS X" partitions. On the first disk, it is 134 Mb, on the second, it is 650 Mb. Digging inside the second partition one will find the BaseSystem.dmg hidden from Finder, but visible through Terminal's ls command: $ diskutil mount disk1s3 Volume Boot OS X on disk1s3 mounted $ ls -lha /Volumes/Boot\ OS\ X/com.apple.recovery.boot/ total 972776 drwxr-xr-x 11 root wheel 374B Jan 29 18:07 . drwxr-xr-x 12 root wheel 476B Apr 22 22:01 .. -rw-r--r--@ 1 root wheel 809B Jan 29 18:07 .disk_label -rw-r--r--@ 1 root wheel 3.2K Jan 29 18:07 .disk_label_2x -rw-r--r--@ 1 root wheel 1.9K Oct 16 2013 BaseSystem.chunklist -rw-r--r--@ 1 root wheel 459M Oct 16 2013 BaseSystem.dmg -rw-r--r-- 1 root wheel 4.2K Aug 24 2013 PlatformSupport.plist -r--r--r-- 1 root wheel 475B Oct 16 2013 SystemVersion.plist -rw-r--r-- 1 root wheel 494K Jan 29 18:07 boot.efi -rw-r--r-- 1 root wheel 361B Jan 29 18:07 com.apple.Boot.plist -rw-r--r-- 1 root wheel 16M Oct 16 2013 kernelcache Trying this on an iMac 27" late 2009, the Recovery Partition does NOT show up when holding the Option key. It is good to mention that the iMac late 2009 was built BEFORE Fusion Drives, thus leading me to conclude that part of its BIOS / UEFI system simply doesn't know to look for that particular recovery partition aside the standard one mentioned on the article. It DOES show up on newer macs that were built AFTER Fusion Drive was available. I hope this helps a bit. =) Edited on Apr 23, '14 10:19:36AM by ila225
Create a Fusion Drive with a Recovery Partition
@ila225 - |
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