Homework / test Arabic to English Tech/Engineering Computers: Software Hard Drive Description

. فالشحنة الكهربائية التي تصل عبر الأسلاك إلى الطرف الخلفي لمقبض أقراء القراءة تحدد مدى استجابات الرأس للمغناطيس تنافرا بناء على موقع البيانات المقروءة على الأقراص

One of our friends here has said that اقراء is a typo for اقراص

I'm not quite getting this process... If someone knows of a good English resource about this (I haven't been able to find one), or just be able explain what happens, I'd be most grateful. Here's what I have right now...

"The electric charge that passes through the wires to the posterior side of the reading disks handle determines the extent to which each head responds to the magnets, ??? based on the location of the data read on the disks. "