Seagate external hard drive cant be read in macos sierra

With the disk(s) connected, please share outputs from the following commands:

diskutil list

diskutil cs list

I am having the same trouble... they are now showing up as unreadable to the mac... I checked the drive on a pc and was able to get in there and look at the files and media.

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage Macintosh HD 120.5 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Macintosh HD +120.1 GB disk1

Logical Volume on disk0s2

B3D214F9-25FD-4F99-8F42-89567FCBBAA7

Unlocked Encrypted

/dev/disk2 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *2.0 TB disk2

1: Windows_NTFS Seagate Backup Plus ... 2.0 TB disk2s1

/dev/disk3 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *128.6 GB disk3

1: Windows_NTFS Backup 128.6 GB disk3s1

//////////////////////////////////////

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 3A128844-8DD7-43C8-A4E7-31DB75A9F5FC

=========================================================

Name: Macintosh HD

Status: Online

Size: 120473067520 B (120.5 GB)

Free Space: 204800 B (204.8 KB)

|

+-< Physical Volume FC7B64A1-D7FF-4DEC-94F5-561475F5BF1E

| ----------------------------------------------------

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 120473067520 B (120.5 GB)

|

+-> Logical Volume Family 3D711441-C517-4C75-ADD2-44135E4861B7

----------------------------------------------------------

Encryption Type: AES-XTS

Encryption Status: Unlocked

Conversion Status: Complete

High Level Queries: Fully Secure

| Passphrase Required

| Accepts New Users

| Has Visible Users

| Has Volume Key

|

+-> Logical Volume B3D214F9-25FD-4F99-8F42-89567FCBBAA7

---------------------------------------------------

Disk: disk1

Status: Online

Size (Total): 120120541184 B (120.1 GB)

Revertible: Yes (unlock and decryption required)

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

Related thread: https://forums.developer.apple.com/message/152743

Thanks.

Is /dev/disk3 (internal, physical) one of the two Seagate drives?

Same here. My Seagate 1TB is not mounting on MacOS Sierra. Tried it on mac running el Capitan and it works just fine. What should i do?

Hi ,

I had the same issue with Seagate 1TB HD, and I've just install this driver http://www.seagate.com/br/pt/support/downloads/item/ntfs-driver-for-mac-os-master-dl/ and it is now working perfectly.

iv had the same problem with 2 of my seagate drives they worked fine before i updated my OSX so whats the fault with sierra when it worked on the capitain perfectly fine ??

please help buddy....I cant do anything on my mac without my hdd..."Failure trying to mount volume" and mac has established my hdd as "dirty"....

i dont know what to do.

try this...I was having the same issue and it solved the problem.

http://www.seagate.com/support/downloads/item/ntfs-driver-for-mac-os-master-dl/

The same problem, but I installed the program and now works fine. I feel bad that Apple do not consider this problem.

I am having the same problem with my Mac Book Pro-2015, I upgraded to Sierra and now I cant use my external Hard Drives, I have 2 of them , 1 is a Toshiba 2TB, and the other one is Touro 1 TB HDD,it wont read them is there a software program i can use to fix this problem?

I am getting the same problem now on mac OS Sierra,

I am having seagate 1TB external power hard drive with 2 partitions with following file system

1. OS X Journeled

2 . FAT32

Now suddenly only OSX Journled partiion is getting mounted and I could not see FAT3.

If I run the command "diskutil list" i can see both the volumes but in finder and diskutility only 1st partition is seen,

IS this the os problem? It occured just now.

thanks man sure seems to be working after i did this

I did this but all I get is a message telling me that the NTFS_for_mac/dmg is damaged & I need to trash it. So no joy here