partition map check failed because no slices we...

Hi,

I own an early 2011 MacBook Pro running Mac OS X Mavericks. Recently, I tried to make 50 GB partition using Disk Utility but the whole process didn't complete, and Ih ad to restart the system as it hanged (Even Force wasn't working). Upon reboot, I saw that I was missing 50GB space. When I tried to

verify the disk, it showed me the following error:

"Partition map check failed because no slices were found."

Can I fix my drive without using external drive? Please help.

snavdeep,

your question can’t be answered yet. In Finder, press Command-Shift-U to open the Utilities folder, and run Terminal in there. In the Terminal window, give it the following commands, one per line, pressing the Return key at the end of each line:

diskutil list

diskutil cs list

mount

Please include in your reply the full output from these commands.

Hi I have this problem with my external hard drive as well. I have a mid-2012 MacBook Pro, running OSX Mavericks 10.9.2

This is the output from running the diskutil commands in terminal.

diskutil list
StephMacBook:~ Mommy$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            644.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                105.0 GB   disk0s4
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *4.0 TB     disk2
   1:                  Apple_HFS Brobdingnagian II       4.0 TB     disk2s2
StephMacBook:~ Mommy$ diskutil cs list
No CoreStorage logical volume groups found
StephMacBook:~ Mommy$ mount
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
/dev/disk0s4 on /Volumes/BOOTCAMP (ntfs, local, read-only, noowners)
/dev/disk2s2 on /Volumes/Brobdingnagian II (hfs, local, nodev, nosuid, journaled)
StephMacBook:~ Mommy$

superfish1984,

your external drive (disk2) is missing an EFI partition. Run the following command in Terminal:

diskutil info disk2

Please include in your reply that command’s full output.

hi, I have the same problem with my external hard drive, am using macbook pro mid 2012 OS X 10.9.3

and the diskutil list shows

lilartists-MacBook-Pro:~ lilartistreem$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 499.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: Microsoft Reserved 134.2 MB disk1s1

lilartists-MacBook-Pro:~ lilartistreem$ diskutil cs list

No CoreStorage logical volume groups found

lilartists-MacBook-Pro:~ lilartistreem$ mount

/dev/disk0s2 on / (hfs, local, journaled)

devfs on /dev (devfs, local, nobrowse)

map -hosts on /net (autofs, nosuid, automounted, nobrowse)

map auto_home on /home (autofs, automounted, nobrowse)

lilartists-MacBook-Pro:~ lilartistreem$

lil_artist5,

it doesn’t look as though you’ve formatted your external disk, since it only has 134.2 MB of 1 TB allocated. Have you tried formatting it in Disk Utility yet?

I am experiencing the same problem. I was on vacation for six weeks with my computer powered down. On return, I am getting this message. The drive in question is a 3 TB Seagate Backup+ drive, connected via USB to one of the USB ports directly on the CPU. It was purchased from The Apple Store but out of warranty. It is a late 2012 Mac Mini, and I am running 10.9.2.

Disk Utility reports that it cannot verify or repair the partition because "Error: Partition map check failed because no slices were found."

However, it displays an available volume, "Seagate Backup Plus Drive," which passes "Verify Disk" with no errors. I use this volume as my Time Machine volume, and it appears to be doing backups with no problem, and backups appear to be visible.

So we have the curious situation that the system does not recognize the drive as having any file system on it, yet the file system that is or was formerly on that drive is visible, mounted, and not reporting errors.

Last login: Thu Jul 3 10:11:32 on console

daniel-smiths-mac-mini:~ Dan$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 499.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk1

1: Apple_HFS Seagate Backup Plus ... 3.0 TB disk1s1

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *250.1 GB disk2

1: EFI EFI 209.7 MB disk2s1

2: Apple_HFS MiniStack 1 249.7 GB disk2s2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: CD_partition_scheme *804.4 MB disk3

1: Apple_partition_scheme 700.4 MB disk3s0

2: Apple_partition_map 32.3 KB disk3s0s1

3: Apple_HFS 289.0 MB disk3s0s2

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk4

1: EFI EFI 209.7 MB disk4s1

2: Apple_HFS WD Auxilliary Volume 1.4 TB disk4s2

3: Apple_HFS Bootable system on M... 548.7 GB disk4s3

daniel-smiths-mac-mini:~ Dan$

daniel-smiths-mac-mini:~ Dan$ diskutil info disk1

Device Identifier: disk1

Device Node: /dev/disk1

Part of Whole: disk1

Device / Media Name: Seagate Backup+ Desk Mac Media

Volume Name: Not applicable (no file system)

Mounted: Not applicable (no file system)

File System: None

Content (IOContent): GUID_partition_scheme

OS Can Be Installed: No

Media Type: Generic

Protocol: USB

SMART Status: Not Supported

Total Size: 3.0 TB (3000592977920 Bytes) (exactly 5860533160 512-Byte-Units)

Volume Free Space: Not applicable (no file system)

Device Block Size: 4096 Bytes

Read-Only Media: No

Read-Only Volume: Not applicable (no file system)

Ejectable: Yes

Whole: Yes

Internal: No

OS 9 Drivers: No

Low Level Format: Not supported

daniel-smiths-mac-mini:~ Dan$

daniel-smiths-mac-mini:~ Dan$ ls -l /volumes

total 8

drwxr-xr-x 38 root wheel 1360 Mar 11 21:00 Bootable system on MyBook

lrwxr-xr-x 1 root admin 1 Jul 3 10:11 Macintosh HD -> /

drwxrwxr-x 13 Dan staff 510 Nov 13 2013 MiniStack 1

drwxrwxr-x 24 Dan staff 884 May 8 07:37 Seagate Backup Plus Drive

drwxrwxr-x+ 21 Dan staff 782 May 8 07:37 WD Auxilliary Volume

daniel-smiths-mac-mini:~ Dan$

Daniel,

if your Seagate drive is used exclusively for Time Machine backups, and the backups are being written properly, and you can restore files from the backups without problems, then what’s the issue? Why are you trying to repair it? (Time Machine could be treating the volume as a 3 TB sparse bundle disk image, which would explain the lack of both partition map and filesystem.)

I agree and I am in no hurry to do anything. The problem seems to stall the boot-up process, because during boot it puts up a dialog box complaining and asking me whether to "ignore" or "eject."

But in general, any unexpected behavior from a disk is cause for concern. Among other things, I am reluctant to apply system updates (e.g. from 10.9.2 to 10.9.4) until I have some idea of what's going on. I think it is very strange that the partition-level tools report no file system on the disk although volume-level tools show a valid volume. I fear that the volume information may have been cached or remembered from a time when the partition data was OK and might be suddenly lost if e.g. power is cycled again or the disk is moved to a different USB port or something...

I'm torn between paying $100 for DiskWarrior versus paying only slightly more for a new disk, and putting it into service as a Time Machine volume before trying to reformat this one...

Daniel,

if you have a spare external disk, you could temporarily put it into service as a Time Machine backup destination, and see how it looks in diskutil, to see whether its partition map and filesystem are similar to or different from the Seagate disk.

This has only been happening since I installed Apple software update to 10.9.4 a few days ago. Since then, I'm having the same issues as snavdeep. My external drive (only used for Time Machine backups) doesn't show up on desktop and can't be accessed, but shows up in disk utility. Says it can't be repaired because no slices/no EFI something or other. This is what showed when I ran diskutil on terminal

any advice on what to do to get the drive back to working?

Thanks

chrisfromburkburnett,

by “can’t be accessed”, do you mean that it’s inaccessible through Finder, or that it’s inaccessible through Time Machine? When you run Time Machine, are you able to view your past backups on your external drive?

Not thru finder nor Time Machine. Time Machine says the drive is not available. Disk utility is the only thing that shows the drive is connected.

Hi Melophage, I have this issue as well, and I have no idea what to do, need your help!

Susannahs-MacBook-Pro:~ Susannah$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 499.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *16.7 MB disk1

1: Apple_partition_map 32.3 KB disk1s1

2: Apple_HFS Flash Player 16.7 MB disk1s2

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk2

1: Microsoft Reserved 134.2 MB disk2s1

Susannahs-MacBook-Pro:~ Susannah$ diskutil cs list

No CoreStorage logical volume groups found

Susannahs-MacBook-Pro:~ Susannah$ mount

/dev/disk0s2 on / (hfs, local, journaled)

devfs on /dev (devfs, local, nobrowse)

map -hosts on /net (autofs, nosuid, automounted, nobrowse)

map auto_home on /home (autofs, automounted, nobrowse)

Susannahs-MacBook-Pro:~ Susannah$

thank you!

chrisfromburkburnett,

try logging in as your administrative user, and then run the following command in Terminal:

sudo gpt show disk1

This command will ask you for a password; give it your administrative user’s password. The password will not appear as you type it in; this is a security measure.

Please include in your reply the full output from that command.

最後更新：2017-09-14 01:55:57

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