On 17-mrt-05, at 0:56, Thomas Burns wrote:
I just picked up a Mac 512k that someone was going to turn into a maquarium (heaven forbid).
My question is how do I make a 400k system disk for it? Someone earlier told me you can make 800k disks by putting tape over the hole on regular 1.4mb disks. Is there any way to format a 1.4 as a 400k?
the tape trick only works for changing 1.4Mb disks to 800k. 800k disks don's have the extra hole.
You can format on any mac running system 6 or lower. system 7 is not suitable because of differences in the desktop file. of course you could use disk copy to put a disk imag of a 400k floppy back on a disk up till system 8, but don't dare to mount the disk on the desktop of a sys 7 and up machine. it will render the floppy unbootable on an older mac.
When formatting a disk on system 6 and lower you get a message if you want a single or doublesided disk. choose single (400k).
Then there is the question of hfs and mfs. hfs (hierarchical file system) is used on the mac since around the introducion of the 800k (double) drives. before that disks were formatted with the mfs (macintosh file system) which was a flat file system, with virtual folders. that is why it is impossible to name two files the same on one disk. on system 6 your disk will defenetly be hfs, unless you used a special key (cmd or ctrl, can't remember) to force the formatting of an mfs disk.
anyway, apple introduced a special pixel in a disk's window to show hfs or mfs. there is a double line just below the titlebar. on the left there is one pixel extra black between the double lines. that indicates hfs. no pixel: mfs. this is as far as i can remember only for system 6 and less, probably back to system 4.1 or so.
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