Idiotic Mac Questions for an Idiotic Mac Newbie Idiot. Idiot. Page 68

  • dominalien 30 Aug 2020 10:55:24 9,936 posts
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    Depends on whether you want to protect yourself from casual scrutiny (ďOh, the Users dir is empty, thereís no way I can access the data now!Ē) or someone using data recovery software to get at your porn pics.

    If itís the latter, you need disk wiping software.
  • Armoured_Bear 30 Aug 2020 11:00:00 29,126 posts
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    dominalien wrote:
    Depends on whether you want to protect yourself from casual scrutiny (ďOh, the Users dir is empty, thereís no way I can access the data now!Ē) or someone using data recovery software to get at your porn pics.

    If itís the latter, you need disk wiping software.
    Yeah, I can't install any software though, I have single-user mode unix access, no internet, no GPU etc.
  • Armoured_Bear 30 Aug 2020 11:11:51 29,126 posts
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    Looks like rm -PR man do the trick.
  • dominalien 2 Sep 2020 09:22:41 9,936 posts
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    The effectiveness of overwriting files on SSDs is highly debatable with their wear levelling and whatnot. As far as I can tell the only effective method is overwriting the entire drive.

    That is unless Apple have modified rm to be effective on SSDs as well, they are known for attention to detail, though Iím not sure if thatís even possible.

    Edited by dominalien at 09:24:24 02-09-2020
  • nickthegun 2 Sep 2020 09:38:10 83,331 posts
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    Wear levelling is the reason apple removed secure delete. But you can buy programs which will 'shred' the file, effectively overwriting it with garbage.

    To erase it for sale, it should be enough to boot into the recovery partition and erase the drive with disk utility a couple of times*.

    *Im a cyber security consultant specialising in computer forensics

    Edited by nickthegun at 09:38:37 02-09-2020
  • Armoured_Bear 2 Sep 2020 10:15:00 29,126 posts
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    nickthegun wrote:
    Wear levelling is the reason apple removed secure delete. But you can buy programs which will 'shred' the file, effectively overwriting it with garbage.

    To erase it for sale, it should be enough to boot into the recovery partition and erase the drive with disk utility a couple of times*.

    *Im a cyber security consultant specialising in computer forensics
    I bought a USB-C -> USB-A cable so I can hopefully boot my Mac mini in target mode and delete the iMac SSD. Good to know I should repeat the process.
  • nickthegun 2 Sep 2020 10:41:16 83,331 posts
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    I mean, one pass should do it, I just do three because im old.

    Without getting properly balls deep into it, SSDs will retain a cache of info that a format wont touch so to properly sanitise a drive, there is some fannying around to be done with something like gparted if you want to purge that too, but a disk util should be enough to stop anything below a nation state actor.
  • dominalien 2 Sep 2020 11:18:20 9,936 posts
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    I would be most grateful if you mentioned, even if briefly, what sort of procedure in gparted that would entail.
  • nickthegun 2 Sep 2020 12:04:41 83,331 posts
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    So... most SSDs support a secure erase protocol which obliterates everything on the drive.

    You can download a gparted live CD or run it from your laptop or whatever. Boot from that, see what partitions are on your drive and what their names are in gparted, open terminal, use hdparm to have a look at your disk and then hdparm security-erase. There are a few more steps in between to set passwords and whatnot, but there are guides out there.

    Caveat: I have never actually done this on a mac. I assume sticking it in target disk mode would work or you can dick around making a live boot USB that will work on as an EFI boot for a mac.
  • Armoured_Bear 2 Sep 2020 12:45:56 29,126 posts
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    Sadly the fucked iMac in target mode isn't showing up as an external disk on the Mac mini it's connected to so don't think I can delete the disk.
  • dominalien 2 Sep 2020 14:28:21 9,936 posts
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    Oh, yeah, didnít target disk mode only work with firewire or thunderbolt? No usb.
  • dominalien 2 Sep 2020 14:31:10 9,936 posts
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    I regularly use Linux tools on Macs and they generally run fine.

    Take a look at Darikís Boot and Nuke. I see itís been bought and commercialised, but there seems to be a free version still which may boot off usb and just wipe the drive.
  • Armoured_Bear 2 Sep 2020 14:34:35 29,126 posts
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    dominalien wrote:
    Oh, yeah, didnít target disk mode only work with firewire or thunderbolt? No usb.
    Apple advice

    "To connect a USB-C port to a USB-A port, use a USB-A to USB-C cable that supports USB 3.0 or USB 3.1, such as the Mophie USB-A Cable with USB-C Connector."

    I tried exactly that but no joy. iMac is in target mode but disk doesn't appear on the most Mac mini.
  • Armoured_Bear 2 Sep 2020 14:36:23 29,126 posts
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    dominalien wrote:
    I regularly use Linux tools on Macs and they generally run fine.

    Take a look at Darikís Boot and Nuke. I see itís been bought and commercialised, but there seems to be a free version still which may boot off usb and just wipe the drive.
    So far I can't boot off anything, I can only get into single-user mode, that's it.
  • dominalien 2 Sep 2020 14:48:58 9,936 posts
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    So if you press alt after turning the computer on no boot menu appears?
  • Armoured_Bear 2 Sep 2020 15:18:49 29,126 posts
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    dominalien wrote:
    So if you press alt after turning the computer on no boot menu appears?
    I get the boot menu and can select USB then It's just white screen, only way to not have white screen is single-user mode.
  • dominalien 2 Sep 2020 18:17:50 9,936 posts
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    But youíre trying to boot macOS, right?
  • Armoured_Bear 2 Sep 2020 20:46:16 29,126 posts
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    dominalien wrote:
    But youíre trying to boot macOS, right?
    Yes.
    It goes to a white screen because it tries to use the GPU which is fucked and it sits there in perpetuity.

    Edited by Armoured_Bear at 20:47:11 02-09-2020
  • Armoured_Bear 2 Sep 2020 20:47:45 29,126 posts
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    Armoured_Bear wrote:
    dominalien wrote:
    But youíre trying to boot macOS, right?
    Yes.
    It goes to a white screen because it tries to use the GPU which is fucked and it sits there in perpetuity.
    And trying to boot from USB Repair disk etc. is the same.
  • dominalien 2 Sep 2020 21:10:16 9,936 posts
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    Well, then, you might try booting something else.

    Edit: not DBAN, though, apparently. The website says it's no good for SSDs, I have no idea if that's true or if it's just a marketing pitch for their commercial offering.

    There's this thing: https://wiki.archlinux.org/index.php/Solid_state_drive/Memory_cell_clearing , perhaps it'll be sufficient for you. Maybe nick can pitch in.

    I'd try booting any Linux distro off USB. If it doesn't manage to load the GUI because of the shot GPU, I'd try booting into console. hdparm should be included.

    Edited by dominalien at 21:27:18 02-09-2020
  • FanBoysSuck 11 Sep 2020 11:35:55 1,653 posts
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    Is it possible to migrate to a new mac when the OS versions don't match?

    My mid 2012 retina pro has just hit end of life so won't be able to install the next OS version. I'm wondering if this is going to cause issues when I get a new one in a year or two.

    I'm considering getting a second hand/refurb machine to tide me over during the architecture change if required.

    Apple only mentions migrations between macs with the same OS version.
  • nickthegun 11 Sep 2020 11:38:14 83,331 posts
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    It will migrate everything it can and tell you about the stuff it cant, its pretty smart.

    Cant speak for the new architecture, obvs, but they handled PPC to Intel pretty well, so I cant imagine much more pain with this transition.
  • FanBoysSuck 11 Sep 2020 11:47:01 1,653 posts
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    nickthegun wrote:
    It will migrate everything it can and tell you about the stuff it cant, its pretty smart.

    Cant speak for the new architecture, obvs, but they handled PPC to Intel pretty well, so I cant imagine much more pain with this transition.
    Ah cool, cheers!

    i imagine it should be ok with the important stuff then, ie files.

    That's good news, I really didn't want to chop in my current machine. Despite Apple's artificial redundancy, an 8 year old i7 2.6, 16gb RAM and 512gb SSD still works fine for general stuff and light development work.
  • beastmaster 11 Sep 2020 12:09:50 21,395 posts
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    One problem you'll have when moving OS is for things like photos. When I moved from Mojave to Catalina I opened up photos and it was fine. After a while I decided to do back to Mojave and when I tried to open Photos, it said it was a newer version and I needed to upgrade my OS. Luckily I had a backup which I used.
  • Fourwisemen 11 Sep 2020 15:41:13 970 posts
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    @FanBoysSuck

    I bought a refurb iMac from https://www.hoxtonmacs.co.uk/ and it was like brand new. Well worth considering these guys, service was excellent.
  • FanBoysSuck 11 Sep 2020 16:05:25 1,653 posts
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    @beastmaster Duly noted. Saying that, I can't see a scenario where I'd need to roll back to an earlier OS.
  • FanBoysSuck 11 Sep 2020 16:07:06 1,653 posts
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    @Fourwisemen Cheers! Although as I mentioned, I'll be holding off now that there's no urgency to get a new machine :)
  • Fourwisemen 11 Sep 2020 18:33:59 970 posts
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    @FanBoysSuck

    You know you want one though..!!! 😳
  • Lukus 29 Sep 2020 21:28:46 23,687 posts
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    Bit of a long shot, but my MacBook Air won't turn on today, was working fine yesterday. It's fully charged but no signs of life.

    Any ideas? It's dead isn't it...
  • elstoof 29 Sep 2020 22:39:12 26,089 posts
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    Have you tried to boot into safe mode
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