AS 3977.1-1991

Specifies requirements for unrecorded magnetic tape designed for High Density Digital Recording (HDDR). This Standard is identical with and reproduced from 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 µm (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.NOTES2 It is recognized that archival interchange tapes, or those produced by systems in use prior to the publication of this part of ISO/IEC 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.

First published as AS 3977.1-1991.