INTERNATIONAL STANDARD ISO 8860 1 1987 TECHNICAL CORRIGENDUM 1 Published 1990 11 15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION~ ME)KAYHAPOflHAfI OPTAHbl3AYtiR fl0 CTAHAAPTM3A~MM ORGANISATION INTER[.]
INTERNATIONAL STANDARD CORRIGENDUM ISO 8860-1 : 1987 TECHNICAL Published INTERNATIONAL INTERNATIONAL ORGANIZATION FOR STANDARDIZATION~ ELECTROTECHNICAL COMMISSION ME)KAYHAPOflHAfI MEXAYHAPOAHAFI 1990-11-15 OPTAHbl3AYtiR fl0 CTAHAAPTM3A~MM 3nEKTPOTEXHl’lqECKAR KOMklCCVIFI ORGANISATION l COMMISSION INTERNATIONALE ELECTROTECHNIQUE DE NORMALISATION INTERNATIONALE on 90 mm Information processing - Data interchange (3.5 in) flexible disk cartridges using modified frequency modulation recording at 958 ftprad on 80 tracks on each side Part 1: Dimensional, TECHNICAL Traitement modulation Partie physical CORRIGENDUM and magnetic characteristics de l’information - Echange de donrkes sur cartouches ti disquette de 90 m m (3,s in) utifisant de frbquence modifiee (MFM) 958 ftprad sur 80 pistes sur chaque face - 7: Caracteristiques RECTIFICA Technical dimensionnefles, TIF TECHNIQUE corrigendum un enregistrement ph ysiques et magnetiques I to international Standard ISO 8860-1 : 1987 was prepared by ISO/IEC JTC 1, Information technology Page iv Annexes Add the following: “F Method for measuring overwrite 23” Page Subclause 6.1.2 Delete “temperature Delete “relative U DC : 10 to 60 OC (50 to 140 OF)” and insert “temperature: humidity : to 80 %” and insert “relative ISO/IEC Printed : 20 % to 80 %” Ref No ISO8860-1 681.327.63 data processing, Descaiptors: magnetic properties ’ humidity 1990 in Switzerland IO OC to 51,5 OC (50 “F to 125 OF)” information interchange, data recording devices, magnetic disks, flexible disks, : 1987Kor.l rjimensions, physical : 1990 (E) properties, ISO 8860-1 : 1987Eor.l : 1990 (E) Page Subclause 9.3.1.6 Delete the last four lines and insert the fol lowing : “shall be less than 150 % of the value of the same ratio for the Master Standard Flexible Disk Cartridge when measu red in accordance with annex F.” Page 23 Annex F Insert the following : Annex F (normative) Method for l measuring overwrite F.1 Readings shall be taken with a frequency-selective Voltmeter centred on 62,5 kHz with a bandwidth 300 r/min, 125 kHz with a bandwidth of kHz to kHz at 600 r/min F.2 Insert the Reference F.3 Erase Track 00 on Side 0, then NQTE - a.c erasure 1s preferred FDC into the test drive, load the heads on Cylinder at f for one revolution record 00 and run the drive for at least on Track 00 using the Test Recording Current but not mandatory F4 Read back and note the Signal amplitude F5 Overwrite F6 Read back and note the Signal amplitude F.7 The overwrite averaged over an integral number of revolutions averaged over an integral number of revolutions with 2f for one revolution ratio is residual F.8 The average F.9 Repeat of at least such ratios, at f after overwrite Signal amplitude after first reco rding with Signal amplitude after correction by the calibration factor, with 2f 1f shall not be greater than 0,05 for the test drive Steps F.3 to F.8 for Side F.10 Repeat F 11 For each side of the cartridge Flexible Disk Cartridge Standard of kHz to kHz at F.2 to F.7 for both sides of the cartridge under under test, the average test of at least such ratios shall be less than 150 % of that for the Master