Mounting partitions on an older MacBook

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Level 1

4 points

Mounting partitions on an older MacBook

I have an old Macbook (13-inch Late 2007) that I have a 2TB USB drive attached to. The drive was partitioned on a Linux machine with 1.5TB on a 32bit DOS partition and .5TB on a Mac OS Extended (Case-sensitive, Journaled) partition.

From my Macbook, I can see and mount the MAC partition but the DOS partition is not visible. I have looked at the disk with Disk Utility and the OSX partition is fine, the DOS partition is visible but it wont mount.

I am looking for ideas.

Posted on Jul 6, 2018 6:43 PM

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Answer 1

Loner T

Level 9

59,536 points

Jul 8, 2018 8:18 AM in response to j.crawford

Try

sudo mkdir -p /Volumes/testmnt

sudo mount -t msdos -o rdonly /dev/disk1s1 /Volumes/testmnt

and post the output.

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Answer 2

Loner T

Level 9

59,536 points

Jul 7, 2018 8:03 AM in response to j.crawford

Can you post the output of

diskutil list

with the external disk connected?

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Answer 3

Loner T

Level 9

59,536 points

Jul 8, 2018 6:19 AM in response to j.crawford

Can you post the mount command that you have tried to use?

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Answer 4

j.crawford Author

Level 1

4 points

Jul 7, 2018 6:44 PM in response to Loner T

Here is the output from "diskutil list":

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Jims MAC 499.2 GB disk0s2

3: Apple_Boot 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *2.0 TB disk1

1: DOS_FAT_32 1.5 TB disk1s1

2: Apple_HFS MAC 527.8 GB disk1s2

Thanks for your help

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Answer 5

j.crawford Author

Level 1

4 points

Jul 7, 2018 8:57 PM in response to Loner T

GPT output is:

start	size index contents
	0	1	MBR
	1	2047
	2048 2867757056	1 MBR part 11
2867759104 1030883328	2 MBR part 175
3898642432	8386736
FDISK output is: Disk: /dev/disk1 geometry: -1539437/4/63 [-387938128 sectors] Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: 0B 1023 254 63 - 1023 254 63 [ 2048 - -1427210240] Win95 FAT-32 *2: AF 1023 254 63 - 1023 254 63 [-1427208192 - 1030883328] HFS+ 3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused 4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused Mac OS X Lion 10.7.5 (11G63b)

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Answer 6

j.crawford Author

Level 1

4 points

Jul 8, 2018 2:13 PM in response to Loner T

The "mkdir" command came back with no errors and no output. There is a testmnt directoty in /Volumes. The "mount" command came back with this:

mount_msdos: /dev/disk1s1 on /Volumes/testmnt: Invalid argument

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Answer 7

j.crawford Author

Level 1

4 points

Jul 8, 2018 3:09 PM in response to Loner T

Here is my Terminal session:

Last login: Sun Jul 8 13:55:20 on ttys000

You have mail.

Jmacbook:~ jim$ sudo mkdir -p /Volumes/testmnt

Password:

Jmacbook:~ jim$ sudo mount -t msdos -o rdonly /dev/disk1s1 /Volumes/testmnt

mount_msdos: /dev/disk1s1: Input/output error

Jmacbook:~ jim$

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Answer 8

j.crawford Author

Level 1

4 points

Jul 8, 2018 4:23 PM in response to Loner T

Thanks for all your help.

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Answer 9

Loner T

Level 9

59,536 points

Jul 7, 2018 7:52 PM in response to j.crawford

Typically, this would be a GPT disk with the two partitions, but 32-bit Fdisk supports disks up to 2TB. Can you post the output of

sudo gpt -vv -r show /dev/disk1

sudo fdisk /dev/disk1

What is the current macOS version on the 2007 Mac?

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Answer 10

Loner T

Level 9

59,536 points

Jul 8, 2018 3:04 PM in response to j.crawford

Can you post the exact Terminal session?

My testing shows...

sudo mkdir -p /Volumes/tstmnt

sudo mount -t msdos -o rdonly /dev/disk0s1 /Volumes/tstmnt

mount -v

/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/disk0s1 on /Volumes/tstmnt (msdos, asynchronous, local, read-only, noowners)

df -h

Filesystem Size Used Avail Capacity iused ifree %iused Mounted on

/dev/disk0s2 354Gi 332Gi 22Gi 94% 87059087 5775489 94% /

devfs 326Ki 326Ki 0Bi 100% 1130 0 100% /dev

map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net

map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home

/dev/disk0s4 122Gi 84Gi 38Gi 69% 356419 39885093 1% /Volumes/BOOTCAMP

/dev/disk0s1 197Mi 73Mi 124Mi 38% 0 0 100% /Volumes/tstmnt

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Answer 11

Loner T

Level 9

59,536 points

Jul 8, 2018 3:16 PM in response to j.crawford

j.crawford wrote:

Jmacbook:~ jim$ sudo mount -t msdos -o rdonly /dev/disk1s1 /Volumes/testmnt

mount_msdos: /dev/disk1s1: Input/output error

Jmacbook:~ jim$

This indicates file system corruption and possibly a failing disk. You can try

diskutil repairDisk disk1

and post the output.

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