91/61055 DC被替代
Amendment To Bs 6958 Guide To Construction & Use Of 90 Mm (3.5 In) Flexible Disk Cartridges For Data Interchange, Using Modified Frequency Modulation Recording At 7958 Ftprad, 5.3 Tpmm (135 Tpi) On 80 Tracks On Each Side Part 2: Track Format (iso 8860-2 Technical Corrigendum No. 1)
出版：British Standards Institution
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