{"disk":"<h1 class=\"section-title\">Disk</h1>\n<p>The disk spins so that different segments of tracks can be read by the <a href=\"#head\">read/write head</a>.</p>\n<p>It consists of different platters.<br>\nEach platter has two surfaces.<br>\nEach surface has a number of circular tracks.<br>\nEach track is divided into segments.</p>\n<figure>\n<p><img src=\"https://tldp.org/LDP/sag/html/hd-schematic.png\" alt=\"disk platters\"></p>\n</figure>\n","spindle":"<h1 class=\"section-title\">Spindle</h1>\n<p>The spindle is a column that the different platters are attached to. It spins to position the wanted segments under the <a href=\"#head\">head</a>.</p>\n","head":"<h1 class=\"section-title\">Head</h1>\n<p>The read/write head reads and writes data at the sector it is over. It is moved by the <a href=\"#boom\">boom</a>.</p>\n","boom":"<h1 class=\"section-title\">Boom</h1>\n<p>The boom or actuator arm moves the <a href=\"#head\">head</a> to different tracks on the disk.</p>\n"}