{"id":174,"date":"2009-09-02T20:21:01","date_gmt":"2009-09-02T09:21:01","guid":{"rendered":"http:\/\/hifi-writer.com\/wpblog\/?p=174"},"modified":"2010-01-27T20:51:16","modified_gmt":"2010-01-27T09:51:16","slug":"blu-ray-error-handling","status":"publish","type":"post","link":"http:\/\/hifi-writer.com\/wpblog\/?p=174","title":{"rendered":"Blu-ray Error handling"},"content":{"rendered":"

\"ScratchedEarly this year I foolishly purchased a Blu-ray disc from one of those shops that insist on opening the sealed cases. It wasn’t until a couple of weeks ago that I got around to doing anything with the disc, and what I did do was scan it with BDInfo<\/a> to gather information for my Blu-ray database. (Yes, I do also watch movies as well! But often the scan comes first.)<\/p>\n

The scanning went swimmingly until about 51 minutes into the disc. At that point, BDInfo informed me that the disc was unreadable. I examined the disc and, yes, there it was. Can you see it in the photo? A scratch! About 1.5 millimetres of nastiness.<\/p>\n

Not just a scratch, but the worst possible kind for a digital media disc: it was at a tangent to a circle concentric to the disc, rather than radial to it. That means that it essentially obscured a sequence of data over a significant length. A radial scratch (ie. radiating from the centre outwards) obscures just as much data, but only a small amount at each point as it crosses the ‘tracks’. The error correction is generally able to reconstruct the original signal in that case.<\/p>\n

But a tangential scratch: if it cannot be read around or through somehow by the laser mechanism, then one this length means too much data is lost for repair.<\/p>\n

I was torn. Should I take the disc back or keep it? I put it into a player I had handy, and it made the player stutter and skip until it had gotten past that point. That sealed it: I decided I’d better keep the disc. Clearly, it was an ideal test disc.<\/p>\n

Thanks to Warner Bros for sending me a shiny new one to replace the damaged one for its original purpose: data gathering and enjoyment.<\/p>\n

Anyway, since this valuable new test has now come into my hands, I have started to use it. Here are my notes for the first two players (no brand names since my reviews haven’t been completed) I tried it on:<\/p>\n

Looped around 51:30 for some seconds, then got back to normal after jumping to 51:47.Paused at 51:02, then skipped to 51:15, then froze at 51:28. Would not skip or ff out of this. Had to stop disc.<\/p>\n

<\/span><\/p><\/blockquote>\n

The first player was less expensive than the second.<\/p>\n

The third player I tried it on was the Oppo BDP-83<\/a>, which I have on long term loan courtesy of the manufacturer and the Australian distributor<\/a>. Here’s my note:<\/p>\n

Played perfectly 3 out of 4 times. 1 out of 4: a tiny stutter at ~51:40.<\/span><\/p><\/blockquote>\n

Who would have thought that a player could make so much difference?<\/p>\n","protected":false},"excerpt":{"rendered":"

Early this year I foolishly purchased a Blu-ray disc from one of those shops that insist on opening the sealed cases. It wasn’t until a couple of weeks ago that I got around to doing anything with the disc, and … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,24],"tags":[],"_links":{"self":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/174"}],"collection":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=174"}],"version-history":[{"count":1,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/174\/revisions"}],"predecessor-version":[{"id":175,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/174\/revisions\/175"}],"wp:attachment":[{"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=174"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}