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Author Creating OS7 installation floppy on OSX? (Read 7402 times)
luisreg
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on: December 20, 2012, 06:50

I'm on OSX Lion with a working Floppy USB unit and brand new 3 1/2 disks, trying to install OS 7.0.1 on a Macintosh Classic with a nre drive (no installed OS currently).

I ran the following command on terminal: dd if=~/OS7/os-6-1.img of=/dev/disk1 bs=84 skip=1

It ends succesfully, but I encounter the following problems:

1) If I try to re-mount on Disk Utility, it returns an error message saying it cannot be mounted.
2) If I eject it after the terminal command, it says I have to initialize it, because it's not formatted (??)
3) If I start my Macintosh Classic with it, it ejects it and doesn't recognize it as an installation disk.

Any ideas?

Thanks!
Luis
wove
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Reply #1 on: December 20, 2012, 14:54

OS X use of dd is slightly different from the dd implementation of GNU Linux.

diskutil list *gives you a list of your devices*

Once you have the number for your device you run

diskutil unmountDisk /dev/diskN  *diskN is the floppy device from the above list*

sudo dd if=~/path/to/image of=/dev/rdiskN bs=84 skip=1  *rdiskN seems to work better in OS X*

Finish the operation with

diskutil eject /dev/diskN *this will ensure that all data is written and nothing is lingering in the cache*

bill
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