11 Jul
2018
11 Jul
'18
1:33 a.m.
Just my experience, I once did a trial where I took two identical 5,25
inch disks of the same batch from the same manufacturer. These were clean
disks which both formatted and verified just fine, but I wanted to see if
IPA did indeed damage the disk.
One I swabbed one with 75% IPA, the other with warm water with a touch of
dishwashing liquid.
On checking the IPA swabbed disk now showed a few damaged sectors. The
water/detergent one did not.
It's not scientific (just one rep) and I was quite aggressive with the
wiping. However, it made me steer away from IPA. Immersing the platters
in warm water with a touch of detergent, and gently wiping (then air
drying) works well for me when cleaning "dirty disks".
Terry (Tez)
On Wed, Jul 11, 2018 at 8:17 PM, Steve Malikoff via cctalk <
cctalk at classiccmp.org> wrote:
Fred asked
What concentration of IPA were you using?
99% Laboratory grade. Not very pleasant to have on the skin, it dries it
out shockingly.
There might be a difference in results between
70% and 91%
There might also even be a difference in the oxide formulation between
brands. (If Chuck was trying to clean a Wabash, then it might dissolve
right through the plastic.)
I've had Computer Resources, Wabash and other cheap diskettes long ago,
they were
none too good. Verbatim and Dysan always seemed pretty reliable for me.