Find your favorite disk partitioning utility. Some of the ones that have been tried and seem to work are: APS Powertools 2.7.3 SCSI Directory Lite Disk Manager Mac from OnTrack HD SC Setup from Apple I/O Formatter from Diversified (?) Silverlining from LaCie You can get "HD SC Setup" from ftp://ftphqx.info.apple.com/Apple_Support_Area/ Apple_Software_Updates/English-North_American/Macintosh/Utilities/ Apple_HD_SC_Setup_7.3.5.sea.bin (this address has been split into several lines for readability). This utility ignores non-Apple hard disks unless you patch it with the application found at . ** First, be sure you have a reliable backup of any data ** which you may want to keep. All information on the hard ** drive you will be repartitioning will be lost. That done, use your favorite partitioning utility to make at least one A/UX "Root & Usr" partition and an A/UX "Swap" partition. The "Root & Usr" partition should be _at least_ 80MB in size if you wish to install all the sets. This partition will be the root partition of your OpenBSD system. Generally, you should allocate twice as much swap space as you have real memory (so, if you have 8MB of RAM, specify 16MB of swap space). Systems that will be heavily used or that are low on real memory should have more swap space allocated. Systems that will be only lightly used can get away with less. If you like, you can also create a smaller root partition and a larger /usr. If you plan to use this machine as a server, you may also want a separate /var. Create these partitions as the BSD "usr" or "User slice X" type. It is also possible to use the Mkfs utility to "convert" partitions from MacOS partitions to BSD partitions. Mkfs will be discussed in more detail later, but it is also very possible to simply prepare your hard drive by partitioning it with MacOS partitions of the correct size. If you do this, simply select the "Convert" button when choosing partitions to build a filesystem on in Mkfs (see below). Before moving on, you should assure that your machine is running the correct software on the MacOS side. In the Memory control panel, you should turn Virtual Memory off whenever you are planning to use the BSD/Mac68k Booter. You should also assure that your machine is using 32-bit addressing. If there is no "Addressing:" option in your Memory control panel and your machine is supported, your probably will need Mode32. Mode32 is a control panel and extension combination which enable 32-bit addressing on older Macs which do not use it by default. This program is available from any Info-Mac mirror. Finally, we recommend strongly that, at least for the purposes of setting the system up, you run with the machine's monitor in 1-bit ("Black and White" in the monitor's control panel) mode. All of that done and accounted for, you are now set to install OpenBSD on your hard drive.