7 Oct
2005
7 Oct
'05
1:19 p.m.
I found a pair of these drives and picked them up since my reference said
that they were quad density drives AND they had DS-QD disks in them.
They are both quad desinty and high density. The 'G' in the model number
means high density, the 'F' means quad density (80 cylinder, double sided).
However I looked on the net and found that everyone
including Teac's site
says that they are HD (1.2Mb) drives. Which are they? I THINK these have a
jumper that chages the speed from 360 RPM to 300RPM. Will this make the
They do.
Howeve, a PC/AT contorller can do the 300kbps data rate. That was
officially to allow the high density drive to read the 360K
double-density disk, but rememebr that disk only had 40 cylinders, so the
head was double-stepped as well. If you use that data rate (or slow the
motor down to 300 rpm) and use all the cylinders (don't double-step), you
get a quad-density drive.
drive a QD drive? I thought the heads needed to be
differnt since the
magnetic media on the disks have different permeability.
No, the heads are the same. The write current is different, but that
drive can do both write currents, controlled, IIRC, by pin 2 on the
interface connector.
-tony