If plugged simultaneously, two cloned external drives not recognised (iMac Sierra)

J

joandres

Registered
I cloned a USB disk with encrypted partitions into another, identical one (same size, same model...). I changed the name of one of the partitions in finder for one of the disks, to be able to tell them apart. When I plug either of the drives by themselves, partitions are recognised fine. When I have one plugged into the computer and I plug the second one, the partitions of this second drive won't appear in finder (or prompt me to enter password), and in Disk Utility the drive appears, but not the partitions. In the information bar, the three partitions are shown, but instead of their names "Apple_CoreStorage" appears for the three of them. I need to plug them at the same time to copy info from one to the other. I'm in a mid-2011 iMac with Sierra OS. Please, help.

Here is the diskutil list run:

Last login: Sat Oct 19 17:51:47 on ttys000
Andress-iMac:~ andres$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 499.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +498.9 GB disk1
Logical Volume on disk0s2
13353748-D5B6-4343-A132-BB1616F05013
Unlocked Encrypted

/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk2
1: EFI EFI 209.7 MB disk2s1
2: Apple_CoreStorage archivo1b 2.8 TB disk2s2
3: Apple_Boot Boot OS X 134.2 MB disk2s3
4: Apple_CoreStorage tm_casa 599.9 GB disk2s4
5: Apple_Boot Boot OS X 134.2 MB disk2s5
6: Apple_CoreStorage tm_oficina 600.4 GB disk2s6
7: Apple_Boot Boot OS X 134.2 MB disk2s7

/dev/disk3 (external, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS tm_casa +599.5 GB disk3
Logical Volume on disk2s4
19C84DEF-EFB8-4457-BC2E-10303161E41C
Unlocked Encrypted

/dev/disk4 (external, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS archivo_1b +2.8 TB disk4
Logical Volume on disk2s2
8D6E6156-B2E0-4DAB-9593-0CA9DAE2716A
Unlocked Encrypted

/dev/disk5 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk5
1: EFI EFI 209.7 MB disk5s1
2: Apple_CoreStorage 2.8 TB disk5s2
3: Apple_Boot Boot OS X 134.2 MB disk5s3
4: Apple_CoreStorage 599.9 GB disk5s4
5: Apple_Boot Boot OS X 134.2 MB disk5s5
6: Apple_CoreStorage 600.4 GB disk5s6
7: Apple_Boot Boot OS X 134.2 MB disk5s7

Offline
Logical Volume tm_oficina on disk2s6
571F39B7-F198-44DE-92C1-52E47FA33260
Locked Encrypted
 
Do you mean that, after a restart, the same drive continues to show in Disk Utility without partition names?

Is there a difference if you shut down, then boot again, still with both drives connected?
Always the same device shows no partition names?

Can you also swap USB ports, so the same drives are not always on the same physical port?

Your 2011 iMac does not have USB 3.0 ports, so one last question:
Do both external drives support USB 3.0 or more - or are they both older drives that are sold as USB 2.0.

Bonus question: Have you tried your copy operation with one or both drives connected through an external hub?
( I am not suggesting purchasing a hub just to test this. :rolleyes: )
 
Yes, they are USB 3.0 capable drives. If I boot the machine with both drives plugged in, the result is the same: one of the drives will not show its volumes. Which, it seems random. I've changed the order in which I plug them, the usb port... Some times one of the drives will show the volumes, and some times the other one. No, I don't have a hub. I was wondering if there is a way to do the dd cloning (or a prior procedure, when formatting the drives) which will mark a difference between the drives recognisable by the system. Thanks for the responses.
 
I suppose you have tried both drives with encryption turned off (?)

Who is the manufacturer of the external drives? which model? (I have a brand new 8TB Seagate Backup Plus Hub that has several issues)
 
They are 4T portable G Technology. I didn't tried to turn off encription. I'm giving up on this. I'll reformat them and make a conventional backup, instead. Anyway, thanks for your help.
 
You must log in or register to reply here.
Back
Top