The Focus Driver and the 20MB Focus.

There are some full size 20MB Focus drives in existance. These are not
part of this issue. The incompatibilites are with the Focus 20 that has
the Kittyhawk drive installed. There are two types of these, those
bought a long time ago and theose bought not as long ago. There was a
period of only using the large (standard 2.5" drives) That separates
the two types. If your drive has the Focus driver installed (blinking
square in upper right corner during drive access) it is compatible. ALL
of the early ones and a few of the later drives are not compatible.
Mostly, when able, the incompatible drives were sold for the //e in the
later set. The way to tell if you have a newer or older one is by way
of the drive connection to the card. On the original series the drives
are attached and you can see pins at a 45 degree angle, on the newer
ones the drive is attached to a connector on the card that is at a 45
degree angle.

You can upgrade the drive size on an older card by simply replacing the
drive and adding the metal mounting rails. On the newer 20 MEg drive
you can not (well, you could) just attach the drive to the card. (As
the drive would then block all slots because it is at a right angle to
the card). That is why the Focus Zero (Controller and mounting rails)
is the same cost as a 20MB drive.

The 20MB drive does not contain the rails and will not accept a
standard drive without blocking all the slots. (Which will work for
those with completly stock systems. No Zip, no TWGS, no nothing. :(

If you want to try the driver with a drive type, although, chances are
if you got the drive without it, it's not compatible. (Unless its in a
//e, you don't know) install the driver (from the 3.5" floppy or web
site) into the system folder and reboot. IF your drive starts clicking
halfway through the boot stage. Get a System Disk 5 or 6 startup disk
and from the Finder, remove the driver from the system folder.

Tip for upgrading/changing drive types:

The Focus controller as is supports up to 2GB, 40 Partitions. When
partitioning the new drive at the point you are prompted to type the
word FORMAT, hit Open-Apple RETURN instead. (Like formatting a floppy
from Finder). It will skip the long and un-needed low level format.
Unless the IDE drive your using was having bad block problems in it's
prior use (and you shouldn't be using that thing anyway) you do not
need to low level format the drive.