6 Aug
2021
6 Aug
'21
10:27 a.m.
On Aug 6, 2021, at 1:21 PM, John Foust via cctalk
<cctalk at classiccmp.org> wrote:
At 11:45 AM 8/6/2021, Jay Jaeger via cctalk wrote:
That was done by a number of people using MR (magneto-resistive) heads. John Bordynuik
was one of them, years ago; some others have done likewise. Those heads were built by IBM
for high density tape cartridges; 6250 is low density for them. They have some nice
properties, from what I understand, one of them is that the output signal levels don't
depend on the tape speed as regular inductive heads do. So for old tape recovery you can
readily run at very low speeds if needed to protect fragile media.
paul
On 8/5/2021 2:57 PM, Len Shustek via cctalk
wrote:
>> On Aug 5, 2021, at 8:39 AM, Jay Jaeger via cctech <cctech at
classiccmp.org> wrote:
>> I know Paul well (we were contemporaries at U. WI).
Where did Paul work at UW-Madison? I don't recall him. I was on campus
from 1981 to 1985.
There is also this one for 9 track drives:
https://github.com/jakubfi/ninetracklab
Has anyone ever developed a method of reading a magnetic tape
with some sort of array of new sensors capable of the pre-1908s
densities and tracks? A fine array of Hall effect sensors?
At 6250 BPI the bits are pretty tiny, aren't they?