—个含有6个盘片的双面硬盘，盘片每面有100条磁道，则该硬盘的柱面数为 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id < 2440371 and id<>'2440371' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id > 2440371 and id<>'2440371' order by id asc limit 5