13 Jan
2018
13 Jan
'18
10:25 a.m.
On Jan 13, 2018, at 12:28 PM, Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
On 1/13/18 9:04 AM, Jon Elson via cctalk wrote:
And that spec is quite clear, "protective overlay". This is the reason for the
legendary robustness of DECtape media. It was possible to wear it out, but only if you
used it -- as done at Lawrence University for example -- as permanently mounted public
file storage so it was read/written many times per hour for months on end. When used as
private removable storage it was pretty much invulnerable. Stories of DECtapes being
laundered by accident and still working fine afterwards have been around for a long time.
paul
I don't know what you are talking about with
Mylar on both sides. They were conventional magnetic tape, a clear mylar
film with oxide applied to one side.
the actual spec is here:
http://bitsavers.org/pdf/dec/dectape/3M_DECtape_Spec_Nov66.pdf