{"id":80,"date":"2015-09-03T15:29:00","date_gmt":"2015-09-03T15:29:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/digital-recording-and-camcorderhard-disk-recording\/"},"modified":"2015-09-03T15:29:00","modified_gmt":"2015-09-03T15:29:00","slug":"digital-recording-and-camcorderhard-disk-recording","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/digital-recording-and-camcorderhard-disk-recording\/","title":{"rendered":"Digital recording and camcorder:Hard disk recording"},"content":{"rendered":"<div class=\"otlbd6a0dbd7f1998f\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '61e5902552e2353963d8d2f1bd1f4a8f',\n\t\t'format' : 'iframe',\n\t\t'height' : 250,\n\t\t'width' : 300,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/61e5902552e2353963d8d2f1bd1f4a8f\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.otlbd6a0dbd7f1998f {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.otlbd6a0dbd7f1998f {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.otlbd6a0dbd7f1998f {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.otlbd6a0dbd7f1998f {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.otlbd6a0dbd7f1998f {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">Hard disk recording<\/h3>\n<p align=\"justify\">Data recording on a <i>har<\/i><i>d disk drive <\/i>(<i>HDD<\/i>) is carried out in the same way as recording on an electromagnetic tape in which a thin magnetic surface is magnetised by a flux produced by an electromagnetic head gap. The disk rotates at a constant speed and data in the form of 0 and 1 bits are written along concentric tracks as shown in Figure 22.11. To retrieve the data from the disk, a read head is used and the process is reversed. Early hard disks used a single read\/write head. Later, <i>metal-in-Ga<\/i><i>p <\/i>(<i>MIG<\/i>) heads were used, and today thin film heads are common. With these later technologies, the read and write head are separate units, but are placed on the same actuator arm.  <\/p>\n<p align=\"justify\">The hard disk consists of a number of rigid disks called platters made of aluminium covered with a thin layer of magnetic coating and placed in a sealed container. A separate read\/write heads are provided for each active  <\/p><div class=\"tulml6a0dbd7f19a9c\" ><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0778475562755157\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- 300x600 television-and-video -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:300px;height:600px\"\n     data-ad-client=\"ca-pub-0778475562755157\"\n     data-ad-slot=\"6549443290\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.tulml6a0dbd7f19a9c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.tulml6a0dbd7f19a9c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.tulml6a0dbd7f19a9c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.tulml6a0dbd7f19a9c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.tulml6a0dbd7f19a9c {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"vzclj6a0dbd7f19a20\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '0c1eb4c533eaedb7b996f49a5a4983a9',\n\t\t'format' : 'iframe',\n\t\t'height' : 300,\n\t\t'width' : 160,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/0c1eb4c533eaedb7b996f49a5a4983a9\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.vzclj6a0dbd7f19a20 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.vzclj6a0dbd7f19a20 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.vzclj6a0dbd7f19a20 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.vzclj6a0dbd7f19a20 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.vzclj6a0dbd7f19a20 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\"><a href=\"http:\/\/lh3.googleusercontent.com\/-K9cLCuTXXCg\/VehnP1MNdLI\/AAAAAAAB7TA\/9EntKBBTx_U\/s1600-h\/Television-and-Video-Technology-0185%25255B2%25255D.jpg\"><img decoding=\"async\" loading=\"lazy\" style=\"background-image: none; border-right-width: 0px; margin: 0px auto; padding-left: 0px; padding-right: 0px; display: block; float: none; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"Television and Video Technology-0185\" border=\"0\" alt=\"Television and Video Technology-0185\" src=\"http:\/\/lh3.googleusercontent.com\/-KX7XLMjzA6g\/VehndRczYYI\/AAAAAAAB7UM\/Sl3B_3ThgUs\/Television-and-Video-Technology-0185.jpg?imgmax=800\" width=\"330\" height=\"432\" \/><\/a>  <\/p>\n<p align=\"justify\">platter surface as shown in Figure 22.12. Each active surface is formatted into a number of tracks known as cylinders and each cylinder is divided into a number of 512-Byte sectors. The disks rotate at a very high angular speed of up to 10,800 rpm and can have a capacity of over 300 GB. The sealed container keeps dust and other contamination away from the sur- face allowing the read-write heads to float on a cushion of air very close to the disk surface which helps to increase the potential size of the disks. The hard disk could be part of a personal computer for general use or dedicated to a single task as in the case of Sky+, <i>personal video recorders <\/i>(<i>PVRs<\/i>) and <i>twi<\/i><i>n tuner terrestrial DTV receivers<\/i>. In all cases, the video and audio must be digitised and compressed before it is stored on the disk.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hard disk recording Data recording on a hard disk drive (HDD) is carried out in the same way as recording on an electromagnetic tape in which a thin magnetic surface is magnetised by a flux produced by an electromagnetic head gap. The disk rotates at a constant speed and data in the form of 0 [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/digital-recording-and-camcorderhard-disk-recording\/\" class=\"more-link\" >Continue reading&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"aioseo_notices":[],"views":577,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/80"}],"collection":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/comments?post=80"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/80\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=80"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=80"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}