partition map check failed because no slices were found

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.

susieq92,

is it disk1 that’s your troublesome disk, or is it disk2? If it’s disk2, then you seem to have the same problem as lil_artist5 did above.

Melophage, after doing your sudo command in the terminal, I proceeded to disconnect my external HD, and the "disc not ejected properly etc." notice. Sure enough when I plugged it back in, it popped right up on my desktop. I would still appreciate your help if you could maybe let me know what to do so that this doesn't happen again, but all seems to be working well now for some reason after a week of nothing.

Thanks

Hi Melophage,

I think it must be a problem with disk 1 because the ext. hard drive has been formatted for mac and used for almost 2 years. I am not sure though if it could still be disk 2. Im not very computer savvy!

chrisfromburkburnett,

I can’t recommend any course of action to ensure that it doesn’t happen again, because I don’t know why it had happened in the first place. On the chance that your external disk is starting to suffer from hardware problems, you might consider purchasing a second external disk for use as an alternate Time Machine backup volume; that way, should your current external disk fail, you’ll still have a usable backup volume.

susieq92,

I’m hesitant to offer suggestions on your situation without knowing which volume is your problem volume — I wouldn’t want to recommend a course of action which might have negative effects on a working volume.

Can you help me please resolve my problem too? I cannot access drive for some reason. I have a data on it that I need. I don't believe that I have formatted it.

Password:

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 4 Pri GPT table

6 32768 1 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE

32774 732533866

732566640 4 Sec GPT table

732566644 1 Sec GPT header

majuskosk,

if you have data on your disk, then at some point it had been formatted. The output from gpt alone doesn’t tell me everything which needs to be known about your problem; please open a new discussion with all relevant details about your situation (which model Mac, which version of OS X, how it currently behaves, output from other commands found earlier in this discussion if you’re receiving the same error which snavdeep did).

To everyone else who might read this discussion,

please open your own discussion with details relevant to your own particular situation; more than enough hijacking has occurred here.

Hi Melophage. Hope you can help me too!

Having the same error message, but for different reasons. I'm using 10.9.4.

Like Daniel here, I'm also using an external 3 TB Seagate Backup+ drive. It was initially plugged in a Netgear WNDR4500 router by USB to be used as NAS. I was in the middle of updating the firmware when there was a power outage. Upon reboot, the drive no longer mounts, whatever it is plugged in (router, Mac, PC, etc.).

I ran DiskUtility on the partition map and volume, same errors. Here's an what I see:

I follow your instructions and issued the Terminal commands, here are the results:

What can I do?

Hi Melophage

I have a late 2011 Macbook Pro. I decided to buy a SDD disk and to move my internal drive as external using a case for SATA disks, connected thru USB3.

When I connect the disk externally, the disk is shown in Disk Utility with no partition!

I tried the option Verify Disk and I've got a few messages:

Verifying partition map for “OEM Ext Hard Disk Media”

Checking prerequisites

Checking the partition list

Problems were found with the partition map which might prevent booting

Error: Partition map check failed because no slices were found.

But it works fine, as soon as I restore it as internal disk!

I have Mountain Lion on the former disk and Mavericks on the SSD one.

Any idea of what's happening?

Following your instructions, here a few details

MacBook-Pro:~ lnoto$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *250.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 248.3 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *499.4 GB disk1

1: EFI EFI 209.7 MB disk1s1

MacBook-Pro:~ lnoto$ diskutil cs list

No CoreStorage logical volume groups found

MacBook-Pro:~ lnoto$ 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)

vfstool#vm-pid38812 on /Volumes/C (prlufs, nodev, nosuid, synchronous, mounted by lnoto)

MacBook-Pro:~ lnoto$ diskutil info disk1

Device Identifier: disk1

Device Node: /dev/disk1

Part of Whole: disk1

Device / Media Name: OEM Ext Hard Disk 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: 499.4 GB (499363373056 Bytes) (exactly 975319088 512-Byte-Units)

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: Yes

Internal: No

OS 9 Drivers: No

Low Level Format: Not supported

Hi Melophage,

I have the same issue. I have followed the procedure suggested by you. It displays the error as follows. Please help me out.

Last login: Thu Oct 16 19:07:59 on console

Ameyas-MacBook-Pro-2:~ Ameya$ disklist

-bash: disklist: command not found

Ameyas-MacBook-Pro-2:~ Ameya$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *250.1 GB disk0

1: Apple_HFS Macintosh SSD 185.7 GB disk0s1

Ameyas-MacBook-Pro-2:~ Ameya$ diskutil cs list

No CoreStorage logical volume groups found

Ameyas-MacBook-Pro-2:~ Ameya$ mount

/dev/disk0s1 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)

Ameyas-MacBook-Pro-2:~ Ameya$

PLease help me with this