peterfromschagen
Level 1 (8 points)
Desktops

Q: Back up disc fails to back up

Yesterdy I have upgraded to MacOs Sierra. Everything works well, but since the upgrade, my back up disc refuses to back up. It sees the disc as an "only read' disc. Before the upgrade it worked normal. What went possibly wrong and what and how can I change it? Thanks in advance.

iMac (21.5-inch, Late 2012), OS X El Capitan (10.11.1), Format conversion after editing

Posted on Oct 7, 2016 3:58 AM

by rkaufmann87,Apple recommended
rkaufmann87 rkaufmann87
Level 9 (58,956 points)
Photos for Mac
A:

peterfromschagen wrote:

 

The used external harddisc is a seagate plus portable 3.5 inch drive 1 gb. I have always used it as back up drive in combination with time machine. I'm not sure how it was formatted, but I did so with the Apple instructions. Never had any problem, until the upgrade to Sierra. the drive is recognised, but only as "read only", which was not the case before. Hope this information helps?

Thank you, is likely was formatted a Mac OS Extended (Journaled). Were you using it as a Time Machine backup HD? If so first reset the SMC and PRAM (the SMC may take 2-3 attempts). Please use the link below for instructions. If those resets fail, connect the EHD with another cable and re-test. If that fails, then your Seagate may have failed and needs to be replaced.

 

iMac SMC and PRAM reset

Posted on Oct 9, 2016 3:54 AM

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peterfromschagen

Q: Back up disc fails to back up

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  • Helpful answers

  • by Boyd Porter,

    Boyd Porter Boyd Porter Oct 7, 2016 4:58 AM in response to peterfromschagen
    Level 4 (1,058 points)
    Oct 7, 2016 4:58 AM in response to peterfromschagen

    Depending the type of drive, the advice may vary. What is your external drive and how is it formatted? Are you using Time Machine?

     

    Backup disks you can use with Time Machine - Apple Support

     

    Have a nice day.

  • by rkaufmann87,Helpful

    rkaufmann87 rkaufmann87 Oct 7, 2016 9:03 AM in response to peterfromschagen
    Level 9 (58,956 points)
    Photos for Mac
    Oct 7, 2016 9:03 AM in response to peterfromschagen

    You haven't provided any useful information such as the backup method you use, the brand of EHD or how it is formatted or what troubleshooting you have done. Please do so, you also may benefit by reading the following user provided tip on Writing an effective Apple Support Communities question

  • by peterfromschagen,

    peterfromschagen peterfromschagen Oct 7, 2016 9:08 AM in response to Boyd Porter
    Level 1 (8 points)
    Desktops
    Oct 7, 2016 9:08 AM in response to Boyd Porter

    The used external harddisc is a seagate plus portable 3.5 inch drive 1 gb. I have always used it as back up drive in combination with time machine. I'm not sure how it was formatted, but I did so with the Apple instructions. Never had any problem, until the upgrade to Sierra. the drive is recognised, but only as "read only", which was not the case before. Hope this information helps?

  • by rkaufmann87,Apple recommended

    rkaufmann87 rkaufmann87 Oct 9, 2016 3:54 AM in response to peterfromschagen
    Level 9 (58,956 points)
    Photos for Mac
    Oct 9, 2016 3:54 AM in response to peterfromschagen

    peterfromschagen wrote:

     

    The used external harddisc is a seagate plus portable 3.5 inch drive 1 gb. I have always used it as back up drive in combination with time machine. I'm not sure how it was formatted, but I did so with the Apple instructions. Never had any problem, until the upgrade to Sierra. the drive is recognised, but only as "read only", which was not the case before. Hope this information helps?

    Thank you, is likely was formatted a Mac OS Extended (Journaled). Were you using it as a Time Machine backup HD? If so first reset the SMC and PRAM (the SMC may take 2-3 attempts). Please use the link below for instructions. If those resets fail, connect the EHD with another cable and re-test. If that fails, then your Seagate may have failed and needs to be replaced.

     

    iMac SMC and PRAM reset