Magnetic Fieldball Mac OS

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These steps apply only to Mac computers with an Intel processor. The steps to erase a Mac with Apple silicon are different.

Before erasing your Mac

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Our Mac has kernel panicked about 5 times today. Below is the crash log if someone could help us out, cheers in advance. Anonymous UUID: 2FBA36C0-0496-067C-BFC9-151393EB378C > >. Free magnet field rar download pc. Education software downloads - MAGNET Field by Topcon Totalcare and many more programs are available for instant and free download. Smallest magnetic card writer in the world! Power adapter NOT required! Full-Version: 3-Tracks, Hi-Co and Lo-Co, Read/Write/Erase Software Works with all the major operating systems as Windows 7, 8, Vista, Xp, 2000(32&64 bits)and Apple Computers(Mac Book Air, Mac Book Pro, Mac Mini, Mac Pro, iMac) and Unix, Linux even Android. The full route from Internet to Mac SE 800k floppies was: WiFi - MacBook Pro 2014 - USB-PATA hard drive - PowerBook G3 Wallstreet (screwdrivers) - SCSI HDI-30 to DB-25 adaptor - SCSI hard drive - Mac LC - 800k floppy - Mac SE. The SCSI drive had to be formatted Mac OS Standard (HFS) not Mac OS Extended (HFS+) if I remember right.

  • Make a backup of any files that you want to keep. Erasing your Mac permanently deletes its files.
  • If you want to restore your Mac to factory settings, such as to prepare it for a new owner, first learn what to do before you sell, give away, or trade in your Mac. Then erase your Mac as the final step.

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Use Disk Utility to erase your Mac

  1. Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.
  2. If asked, select a user you know the password for, then enter their administrator password.
  3. From the utilities window, select Disk Utility and click Continue.
  4. Select Macintosh HD in the sidebar of Disk Utility. Don't see Macintosh HD?
  5. Click the Erase button in the toolbar, then enter the requested details:
    • Name: Macintosh HD
    • Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility
  6. Click Erase Volume Group. If you don't see this button, click Erase instead.
  7. If asked, enter your Apple ID. Forgot your Apple ID?
  8. After the erase is done, select any other internal volumes in the sidebar, then click the delete volume (–) button in the toolbar to delete that volume.
    Disregard any internal volume named Macintosh HD or Macintosh HD - Data, as well as any volumes in the External and Disk Images sections of the sidebar.
  9. Quit Disk Utility to return to the utilities window.
  10. If you want to start up again from the disk you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions to reinstall macOS.

If you don’t see Macintosh HD in Disk Utility

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Your built-in startup disk should be the first item listed in the Disk Utility sidebar. It's named Macintosh HD, unless you changed its name. If you don't see it there, choose Apple menu  > Shut Down, then unplug all nonessential devices from your Mac and try again.

If your disk still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your Mac might need service. If you need help, please contact Apple Support.

Learn more

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For more information about using Disk Utility, see the Disk Utility User Guide.

Context, since it's not spelled out with a lot of background in the article: most floppy drives spin at a fixed RPM, which is referred to as a Constant Angular Velocity (CAV: ie, no matter how far out on the disk you are, the disk rotates by a constant angle per second). This means that towards the outer edge of the disk more magnetic media is passing under the head per second than towards the inner edge of the disk (with a larger circumference, a constant angle will represent a longer chunk of media). If you're writing the same number of bits per second, this means each bit takes up a larger amount of magnetic media at the outer edge compared to the inner edge.

If, instead, the drive spins at a Constant Linear Velocity (CLV: ie, the same amount of magnetic media passes under the head per second no matter where on the disk you're accessing[1]), each bit can take up the same amount of magnetic media, which means you can store more bits per track towards the outer edge of the disk. Macs did this in order to increase the amount of data you could store, at the cost of additional complexity in the drive to support spinning at different rates. It also means that 800K Mac disks (the largest format which used variable rates) can't be read on normal PCs, which lack support for variable rates.

FluxEngine works at a lower level than the standard PC floppy interface - it allows the OS to look at the actual magnetic flux data on the disk, whereas the standard PC floppy interface will only pass back the interpreted bits. Even if the disk is spinning at a constant RPM, knowing where the head is located allows that magnetic flux data to be turned back into the appropriate bitstream (or vice versa for writing) and allows handling CLV disks even though they're in a CAV drive.

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[1] Except it doesn't actually do that - there's only 4 different speeds, as you can see in https://github.com/davidgiven/fluxengine/blob/7eaf3de5723436... .