_ _'_-2 _ N93- 15041 o 121 Z 4- _ o o oO c- "_ O CD 0 _ _" o oJ 0 aj C LI_ e o O0 _ co 6 o z 0 0 ° _,,,,,,,_ OI 0 f_b 0 r_ 0 a Z J 206 _2 O_ 0 Cl ._I Z 0 rj 0 (/) (/) c :::i. "-- CO (D 1.0 0 0 _O _ 10 0 .u ¢- i- 0 _ _ ¢_ c .2 .2 .o ._o .2 7- U_ LL LL I-" 7- 7- 7- 7- 7- (/) 0 r7 o I:: k.. Recording Bit Density Comparison Linear, Low Density: 2060 bits per inch, 20 mil width; 165X. Helical, High Density: 45,000 bits per inch, 1.2 nail width; 165X. 0 0 CI ._l Z J 2O0 a Z \ "O \ c- \ \ \ mu m \ \ \ C CV E J 210 (_ .-I Z -r" {/) m 0 >, X _W 0 ' T >, o 0 _0 .,=' 0 m T > T 0 0 _ _ Q 0 X l.U 211 °_ 0 0 ...J a Z E _ m >, m IID o_ e- o _ m -r m | | | | • | I | | o <_'- r_ 0 C_ c_ z C_ Ct_ -r ! o_ _D w II O Ltij m I L_ u ! E C_ c_ ,Tn [] ct_ -r c_ ! C3_ LO _ t- I Lt_ 8 o_ [] C_J Lt_ C_ T Tm I o Lt_ o I_I. CD -c= a..c_