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  1. #16


    Member Since
    Oct 16, 2010
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    I'd agree with what you found and discovered with DW and CCC, and a Finder copy, from my own experiences.

    For the "zero out" formatting option, have a look here:
    http://www.macworld.com/article/1141...ard_drive.html
    and close by here:
    http://www.mac-forums.com/os-x-opera...-yosemite.html

    PS: a zero-out or one pass security write/wipe is basically doing the same thing. And don't even think of or bother or doing an absurd 7 pass, that's just super overkill and there for the government paranoid folks!!!

  2. #17

    michelangelo's Avatar
    Member Since
    Apr 24, 2008
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    MacBookPro, iMac, OS 10.13.2, iPhone 5c iOS 10.3.2, iPad mini, iOS 9.3.5
    Thanks for the tip. I did zero out all of the data using disk utility. One pass. 7 hours for 2 TB. Then I redid my two partitions and two clones (each a clone, respectively, of my internal HD and my external HD). Not very difficult, quite time consuming for the mac (not for me, I was sleeping). After that, I did not notice any difference. If I get it right, the objective of this move was to zero all of the data which would map the bad sectors on the reformatted (resurrected) drive, hence my drive would be a more reliable clone after than before. How can I test that this objective (reliability) is achieved ?

    Would I have attained the same results with one full defrag (in each of the two partitions) with iDefrag ?

    How about Spinrite ?
    -- Michelangelo
    https://www.abeille-cyclotourisme.fr/
    MacBookPro, iMac, iPhone 5c, iPad mini, AirPort Time Capsule (1st Generation), AirPort extreme (3rd generation), Apple TV (1st generation)

  3. #18


    Member Since
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    Location
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    You got the objective of exercise correct and I have no idea if iDefrag or Spinrite could do the same, but I very much doubt it and I don't know of any testing software you could use. But that's why one needs to have a backup and if the HDD starts acting goofy, you and Disk Utility will probably know.

    Actually the wipe/write/read "one pass process" would probably have let you know if some part had failed, and as it didn't I gather, I'd say it passed.

    PS: Can you imagine doing the absurd "US military standard" 7-pass wipe??? That's gotta be such a typical military super overkill operation — big understatement!!
    Last edited by pm-r; 10-24-2015 at 01:32 PM.

  4. #19

    michelangelo's Avatar
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    MacBookPro, iMac, OS 10.13.2, iPhone 5c iOS 10.3.2, iPad mini, iOS 9.3.5
    Thanks.
    -- Michelangelo
    https://www.abeille-cyclotourisme.fr/
    MacBookPro, iMac, iPhone 5c, iPad mini, AirPort Time Capsule (1st Generation), AirPort extreme (3rd generation), Apple TV (1st generation)

  5. #20


    Member Since
    Jan 02, 2018
    Posts
    2
    Similar problem
    Hi,

    I found this thread where the original post seems quite close to the issue I'm dealing with.

    I have a Lacie external USB drive that stopped mounting on my MacBook Pro about a week ago. It lights up, makes noises, and spins just as it did when it was working normally; it just won't show up in the Finder. I've switched USB cables and even switched Macs, trying to mount the drive both on my old laptop and the one I got a few months ago.

    I used the Terminal commands that were suggested on the first page of this thread. The "diskutil list" does show the LaCie drive when it's plugged in, appearing thus:
    /dev/disk2 (external, physical):
    #: TYPE NAME SIZE IDENTIFIER
    0: Apple_partition_scheme *2.0 TB disk2
    1: Apple_partition_map 32.3 KB disk2s1
    2: Apple_HFS LaCie 2.0 TB disk2s3

    The "diskutil mount /dev/disk2s2" command returns the following:
    "Unable to find disk for /dev/disk2s2"

    Since the volume shows up in the Diskutil List as "slice 3" (disk2s3), I tried the above command twice with "disk2s3" as well, and both times got the following:
    "Volume on disk2s3 timed out waiting to mount"


    Can anyone please help interpret this? I get that in a general sense, the computer recognizes the disk in some way but not in a way that will allow the disk to mount and me to work with its contents.


    Also, FWIW, when I open the Disk Utility app with the drive already plugged in, it says it's searching for disks and shows the spinning wheel, but as soon as I turn off the drive, it immediately shows the internal HD normally.


    Any help is much appreciated!

  6. #21

    chscag's Avatar
    Member Since
    Jan 23, 2008
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    54,477
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    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Welcome to our forums. Before I answer your question, be sure to read the special notice in the forum announcements about these forums shutting down.

    The LaCie external hard drives are famous for poor electronics and failing electronics. I'm guessing your drive is OK but the case and electronics are either failing or have failed. The remedy is to remove the drive from the case and use an adapter to get at your data. If the LaCie is still under warranty you do not want to remove the case as that will void your warranty. However, if you have data on that drive you need, the only way to extract it is probably what I suggested above.

  7. #22

    michelangelo's Avatar
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    Apr 24, 2008
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    MacBookPro, iMac, OS 10.13.2, iPhone 5c iOS 10.3.2, iPad mini, iOS 9.3.5
    Hey smorrison01. Be prepared to migrate out as the Mac-forums are now in a warp zone. And thank you for waking me up from a long absence from the Mac-forums. I got warmed-up by your post on my original thread. Welcome.

    I failed in my recovery attempts, which was a big blow for me. So my advice is not really worth the read. Still:

    1 - Members of this forum were extremely helpful, while I was full of ****, they all tried their best to help. Follow them to the new forum.

    2 - My FireWire LaCie big is still alive today after my reformatting it with one pass of zeroes. It's current job is to serve as the Sunday clone of my MacBook Pro. Drivedx checks on it every sunday. So far so good. But most of my data was lost. Many dots of data were foggy on the surface of the disks by years of non-use. But overall, there was nothing broken in the disks nor in the case.

    3 - Given the above, I believe it quite possible for spinrite to have been able to save my data: to have been able to understand and re-write a sufficient number of foggy bits of data. Spinrite, written in assembly language for perfection and speed is believed to be usable on a Mac with Wine. I have not tried that and cannot try it anymore, after having reformatted the drive.

    Good luck to you.
    -- Michelangelo
    https://www.abeille-cyclotourisme.fr/
    MacBookPro, iMac, iPhone 5c, iPad mini, AirPort Time Capsule (1st Generation), AirPort extreme (3rd generation), Apple TV (1st generation)

  8. #23


    Member Since
    Jan 02, 2018
    Posts
    2
    Thanks chscag and michelangelo. I did see the notice about the forums shutting down - when I went to the forum home page after making my earlier post!

    Because of that, I'll assume I might be shouting into the void, and you or anyone else may not see this or reply. Accordingly I'll assume that I have to do further research elsewhere.

    BUT - in case you do see it and it's still possible to respond:
    I understand your explanation in concept, chscag, but I have no idea what I'd be looking for if I sought out an adapter. Is there some example of what kind of adapter allows you to communicate with a partially disassembled hard drive, and/or where I might find such a thing?

    Thanks again!

  9. #24


    Member Since
    Oct 16, 2010
    Location
    Brentwood Bay, BC, Canada
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    Is there some example of what kind of adapter allows you to communicate with a partially disassembled hard drive, and/or where I might find such a thing?
    I think what's being referred to is what is called a usb sata adapter or USB Bare Drive Adapter such as this at:
    https://eshop.macsales.com/item/NewerTech/U3NV2SPATA/

    Or most computer places and amazon, staples. etc…

    And for more convenience, the various Docks are nice, i.e. but you may only need the bare dock:
    https://eshop.macsales.com/search/?q=sata+dock





    - Patrick
    ======
    Last edited by pm-r; 01-09-2018 at 11:07 PM.

  10. #25

    michelangelo's Avatar
    Member Since
    Apr 24, 2008
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    Specs:
    MacBookPro, iMac, OS 10.13.2, iPhone 5c iOS 10.3.2, iPad mini, iOS 9.3.5
    Also, given that Chscag was referring to failing electronics and case on a possibly non-failing drive, you also have, in addition to bare drive adapters and docks, the various more permanent cases (or enclosures) available at the same stores for about 10 to 20 apiece. In my earlier situation, the electronics and case had not failed on me: the drives were only experiencing memory loss, mainly due, probably, to a very long period of non-use. My drives were top of line 7200 rpm drives with FireWire connectors (partially failing, to state the truth). One of my two cases contained two 500 GB disks. It was dead and its connectors were dead. I opened it and recovered the two disks one of them is in a case, serving as a backup drive. The other case, which was discussed along this thread, a LaCie Big, contains 4 times a 500 GB disks (totaling 2000 GB, or 2 TB) is still in use, not opened. Opening the case voids the warranty... And would be quite hard to reassemble anyway.

    Last, given that your LaCie drive is USB only, it may not be top of the line and the probability of dead case or connectors is higher. HTH
    -- Michelangelo
    https://www.abeille-cyclotourisme.fr/
    MacBookPro, iMac, iPhone 5c, iPad mini, AirPort Time Capsule (1st Generation), AirPort extreme (3rd generation), Apple TV (1st generation)

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