ISO/IEC 8441-1:1991

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.