ISO/IEC 8441-1:1991

Information technology — High density digital recording (HDDR) — Part 1: Unrecorded magnetic tape for (HDDR) applications ISO/IEC 8441-1:1991

Publication date:   May 16, 1991

Scope

This part of ISO/IEC 8441 specifies requirements for
unrecorded magnetic tape designed for high density
digital recording (HDDR) having the following
characteristics:

a) nominal thickness 25,4 urn (0,001 in);

b) longitudinal magnetic orientation;

c) coercivity 72 kA/m (900 Oe) max.

These tapes are suitable for interchange in accordance
with ISO/IEC 8441-2.

Requirements for packaging are also included.

NOTE 1 Tapes of coercivity above 32 kA/m (400 Oe) are
usually classified as high energy tapes and users should
establish compatibility with equipment used for driving
them.

Annex A gives guidance on glass and metal-flanged
reels. Annex B gives information on the wear of recording
heads. Different categories of environmental
conditions and their effects on tape are dealt with in
annex C. Severe operating conditions are considered
in annex D. Surface electrical resistance
testing is dealt with in annex E. A tape abrasivity
testing technique is described in annex F. A list of
bibliographical references is given in annex G.

NOTES
2 It is recognized that archival interchange tapes, or
those produced by systems in use prior to the publication
of this part of ISO/lEC 8441, may not comply with the requirements
and/or recommendations herein.
3 Various tests and procedures herein refer to recording
with a.c. HF bias. In practice, certain HDDR systems do
not use bias. The use of bias in this part of ISO/IEC 8441
does not imply that the tape so tested is in any way unsuitable
for a biasless system.