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  1. #1
    Lost 5 TB external drive com
    I wanted to connect an extra external drive for Time Machine backup
    During the installation process I decided to rename the drive to: "5TB sølv"

    The external drive is a 5 TB Seagate Backup Plus and I had to allow a formatting
    During the start of the formatting process an error occurred and I am no longer able to see the drive

    How du I regain acces to my brand new external drive?

    It does no longer show up, where I normally will find connected drives.

    I have tried to:
    1) Unplug and replug the drive.
    2) Reboot the mac book pro that is running Catalina OS 10.15.1

  2. #2
    I am now following this guide and the drive is visible in the disk utility tool, now I "just" need to fix it.
    USB External Troubleshooter | Seagate Support US

  3. #3
    Lost 5 TB external drive com
    Slydude's Avatar
    Member Since
    Nov 16, 2009
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    North Louisiana, USA
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    Your Mac's Specs
    2.8 GHz 2008 MacBook Pro 10.11, 8 GB mem, iPhone XS, 2015 iMac 16 GB 10.14.4 beta
    Rep Power
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    Since you can see the drive in Disk Utility I suspect that the drive just isn't mounted. Until it's mounted successfully other software, such as Time machine, can't use it. Here's something to try:

    1. With the drive attached right-click the drive.
    2. In the contextual menu that appears, choose "Mount".

    That should allow you to format the drive, if necessary, and then designate it as a Tine Machine drive.
    “Hard work beats talent when talent fails to work hard.”
    Kevin Durant

  4. #4
    The disk doctor found 0 faults
    The drive was "inactive"

    I had to mak a new partition of the drive and named it: "5"
    After that the drive got visible in finder again

    I made it an EXFAT partition because I wants to yse the drive for MAC OS and WIN OS

    When I retried to make it a Time Machine backup drive, the MAC did not accept the format, even thou this link says it would be possible to use EXFAT:
    How to Format a Hard Drive For Both Windows and Mac | Laptop Mag

    I again accepted an erase of the drive.
    Again an error occurred and I am back to start = the drive is no longer visible in finder :-(

    Der opstod en fejl under forberedelse af Time Machine-disken til sikkerhedskopiering “5”.
    An error occurred during preparation of the Time Machine-disk for backup "5"

    POSIX-rapporter: Handlingen kunne ikke udføres. Ugyldigt argument.
    POSIX-rapport: Request could not be performed. Illegal argument.

    How do I get a Time Machine backup disk usable for WIN OS as a storage media for films/movies as well?
    Do I have to give it 2 partitions, and if yes is it possible to reach my objective by doing that?

  5. #5
    Lost 5 TB external drive com
    krs's Avatar
    Member Since
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    Quote Originally Posted by Morten3007 View Post
    How do I get a Time Machine backup disk usable for WIN OS as a storage media for films/movies as well?
    Do I have to give it 2 partitions, and if yes is it possible to reach my objective by doing that?
    I didn't think one could do that - set up Time Machine on an ExFat or any other Windows-type formatted drive.
    Time Machine is very much Mac-specific.

  6. #6
    Lost 5 TB external drive com
    Slydude's Avatar
    Member Since
    Nov 16, 2009
    Location
    North Louisiana, USA
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    Your Mac's Specs
    2.8 GHz 2008 MacBook Pro 10.11, 8 GB mem, iPhone XS, 2015 iMac 16 GB 10.14.4 beta
    Rep Power
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    I think I see what part of your issue is and it has to do with the drive formatting. When you tried this did you do steps 5 through 12 or did you skip them? The first time I read the article I skipped those steps and thought he was suggesting using ExFAT for Time Machine which it doesn't support. To make that work you have to use steps 5 - 12 to make part of the drive HFS+ and store the Time Machine backups on that partition.

    I used a drive with HFS+ FAT 32 formatting several years ago and abandoned it. I had issues mounting both partitions properly on a consistent basis. I also dropped the idea when I saw so many reports of data being lost. The losses seem to be the result of the same kind of "twitchy" formatting issues you're experiencing.
    “Hard work beats talent when talent fails to work hard.”
    Kevin Durant

  7. #7
    I have concluded that is is not possible to use a Time machine backup drive for WIN OS and has now formatted it as journaled (EXFAT is not usable for Time machine).
    The backup is now working on my 5 TB Seagate Backup Plus drive :-)

    I will have to use another external drive for shared movies between MAC and WIN ;-)

  8. #8
    Lost 5 TB external drive com
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
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    59,065
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    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
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    It's always best to keep your backups separate from any other data. I currently have 5 external hard drives on my desk next to my iMac. Nowadays, external drives are inexpensive so there is no need to share your backup drive with anything else.

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