OSX: 10.10 precautions for installing Yosemite Developer Preview 2

As mentioned in the previous article, after 10.10 dp2 is installed, in the disk tool that shows each partition, each partition looks a bit strange, because it converts the original normal partition to core storage.

The following figure shows the internal status of the disk after I install it in a common mac3 (disk1s5) partition. Refer to my previous three blogs (OSX: logical volume management system core storage (1), OSX: logical volume management system core storage (2) and OSX: core storage (3) of the logical volume management system.

The following is the result of running the diskutil list. The original apple_hfs mac3 at disk1s5 is replaced by apple_corestorage, and an additional disk2 apple_hfs x.10dp2 (note: x.10dp2 is the result of renaming mac3 ):

/dev/disk1   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:      GUID_partition_scheme                        *120.0 GB   disk1   1:                        EFI                         209.7 MB   disk1s1   2:                  Apple_HFS X.93                    29.5 GB    disk1s2   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3   4:                  Apple_HFS Mac2                    30.0 GB    disk1s4   5:          Apple_CoreStorage                         19.5 GB    disk1s5   6:                 Apple_Boot Recovery HD             650.0 MB   disk1s6   7:                  Apple_HFS Mac4                    29.3 GB    disk1s7   8:                  Apple_HFS Test                    9.9 GB     disk1s8/dev/disk2   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:                  Apple_HFS X.10dp2                *19.0 GB    disk2

This is the result of viewing disk1s5. You can see its original name is mac3:

<span style="color:#009900;">$diskutil info disk1s5</span>   Device Identifier:        disk1s5   Device Node:              /dev/disk1s5   Part of Whole:            disk1   Device / Media Name:      Mac3   Volume Name:              Not applicable (no file system)   Mounted:                  Not applicable (no file system)   File System:              None   Partition Type:           Apple_CoreStorage   OS Can Be Installed:      No   Media Type:               Generic   Protocol:                 FireWire   SMART Status:             Not Supported   Total Size:               19.5 GB (19484213248 Bytes) (exactly 38055104 512-Byte-Blocks)   Volume Free Space:        Not applicable (no file system)   Device Block Size:        512 Bytes   Read-Only Media:          No   Read-Only Volume:         Not applicable (no file system)   Ejectable:                Yes   Whole:                    No   Internal:                 No

The following figure shows disk2. The media name is the disk Name:

$ <span style="color:#009900;">diskutil info disk2</span>   Device Identifier:        disk2   Device Node:              /dev/disk2   Part of Whole:            disk2   Device / Media Name:      LaCie Group SA   Volume Name:              X.10dp2   Escaped with Unicode:     X.10dp2   Mounted:                  Yes   Mount Point:              /Volumes/X.10dp2   Escaped with Unicode:     /Volumes/X.10dp2   File System Personality:  Journaled HFS+   Type (Bundle):            hfs   Name (User Visible):      Mac OS Extended (Journaled)   Journal:                  Journal size 8192 KB at offset 0x98000   Owners:                   Disabled   Content (IOContent):      Apple_HFS   OS Can Be Installed:      Yes   Media Type:               Generic   Protocol:                 FireWire   SMART Status:             Not Supported   Volume UUID:              D237CD21-49AE-351F-B2A8-E559D61BDC51   Total Size:               19.0 GB (18997837824 Bytes) (exactly 37105152 512-Byte-Blocks)   Volume Free Space:        5.7 GB (5718700032 Bytes) (exactly 11169336 512-Byte-Blocks)   Device Block Size:        512 Bytes   Read-Only Media:          No   Read-Only Volume:         No   Ejectable:                Yes   Whole:                    Yes   Internal:                 No   OS 9 Drivers:             No   Low Level Format:         Not supported

This is based on core storage:

<span style="color:#009900;">$ diskutil cs list</span>CoreStorage logical volume groups (1 found)|+-- Logical Volume Group 76704EE0-1F96-4F64-A28A-C7A8471109B2    =========================================================    Name:         <span style="color:#ff0000;">Mac3</span>    Status:       Online    Size:         19484213248 B (19.5 GB)    Free Space:   150827008 B (150.8 MB)    |    +-< Physical Volume D9465F3E-46B6-47FD-9D31-330FA7255E02    |   ----------------------------------------------------    |   Index:    0    |   Disk:     disk1s5    |   Status:   Online    |   Size:     19484213248 B (19.5 GB)    |    +-> Logical Volume Family DF805042-6E4A-4EB5-AB4F-51B15E3A1CB3        ----------------------------------------------------------        Encryption Status:       Unlocked        Encryption Type:         None        Conversion Status:       NoConversion        Conversion Direction:    -none-        Has Encrypted Extents:   No        Fully Secure:            No        Passphrase Required:     No        |        +-> Logical Volume 7588EF0D-4DEE-4A27-99AC-95371434A42A            ---------------------------------------------------            Disk:               disk2            Status:             Online            Size (Total):       18997837824 B (19.0 GB)            Size (Converted):   -none-            Revertible:         Yes (no decryption required)            LV Name:            X.10dp2            Volume Name:        X.10dp2            Content Hint:       Apple_HFS

Once converted to using core torage, all the partitions on the entire disk cannot be changed in the disk tool !!! You can only use terminal commands-this is one of the reasons why many people cannot change the partition size.

Expectation: the new core storage version may take on the important responsibilities and may release the first official version. The disk tool should also support more functions for the core storage, such as changing the partition size, create new partitions.

Let's look forward to it, or wait and see.