<div dir="auto"><a href="https://superuser.com/questions/879216/how-to-determine-whether-blu-ray-disc-is-htl-or-lth" rel="noreferrer noreferrer noreferrer" target="_blank">https://superuser.com/questions/879216/how-to-determine-whether-blu-ray-disc-is-htl-or-lth</a><div dir="auto"><br></div><div dir="auto">lists two methods one with cdrecord + internet, another one using imgburn</div><div dir="auto"><br></div><div dir="auto">===</div><div dir="auto"><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">Here's the best way I've found:</p><ol style="margin:0px 0px 0px 30px;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:15px;vertical-align:baseline;list-style-position:initial;color:rgb(35,38,41);background-color:rgb(255,255,255)"><li style="margin:0px 0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;font-size:16.2163px;vertical-align:baseline"><p style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline">Determine the manufacturer code and media type of the media. On Linux, I used <a href="http://cdrtools.sourceforge.net/private/cdrecord.html" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;font-size:15px;vertical-align:baseline" rel="noreferrer noreferrer" target="_blank"><code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;vertical-align:baseline;white-space:pre-wrap">cdrecord</code></a> <code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;vertical-align:baseline;white-space:pre-wrap">dev=XXX -atip | grep -i 'manufacturer\|media type'</code>, where <code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;vertical-align:baseline;white-space:pre-wrap">XXX</code> is the code for the Blu-ray burner as listed by <code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;vertical-align:baseline;white-space:pre-wrap">cdrecord -scanbus</code>.</p></li><li style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;font-size:16.2163px;vertical-align:baseline"><p style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline">Look up the manufacturer and media type codes at <a href="http://www.blu-raydisc.info/licensee-list/discmanuid-licenseelist.php" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline" rel="noreferrer noreferrer" target="_blank">http://www.blu-raydisc.info/licensee-list/discmanuid-licenseelist.php</a> . The table on that site identifies "recording type" (i.e. HTL or LTH) and also write speed from these codes.</p></li></ol><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">=== quote end====</span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px"><br></span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">site worked when I clicked on link.</span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px"><br></span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">Apparently LTH should be marked due to their bad compatibility with earlier drives, but .... reality is less stellar :(</span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px"><br></span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">and in imgburn</span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px"><br></span></font></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">====</span></font></div><div dir="auto"><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">With image burning software. <a href="http://www.imgburn.com/" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline" target="_blank" rel="noreferrer">ImgBurn</a> for instance.</p><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">In Imgburn main menu just click on anything writing related. For example, "Write image file to disc"</p><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">Now a new window pops up</p><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">Please check that you have the correct burner selected in the left hand side, if you have more than one disc burner.</p><p style="margin:0px 0px 1.1em;padding:0px;border:0px;line-height:inherit;font-family:-apple-system,blinkmacsystemfont,"segoe ui adjusted","segoe ui","liberation sans",sans-serif;font-size:16.2163px;vertical-align:baseline;color:rgb(35,38,41);background-color:rgb(255,255,255)">Scroll down on the right pane, and you find the info under "Recorded Mark Polarity"</p></div><div dir="auto"><font color="#232629" face="-apple-system, blinkmacsystemfont, segoe ui adjusted, segoe ui, liberation sans, sans-serif"><span style="font-size:16.2163px">====</span></font></div></div><div dir="auto"><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">HTL is apparently more durable....</div><div dir="auto"><br></div><div dir="auto">Terje posted link to Canadian site and I did little search on my own</div><div dir="auto"><br></div><div dir="auto"><a href="https://www.pcworld.com/article/423607/hard-core-data-preservation-the-best-media-and-methods-for-archiving-your-data.html">https://www.pcworld.com/article/423607/hard-core-data-preservation-the-best-media-and-methods-for-archiving-your-data.html</a><br></div><div dir="auto">(from 2016)</div><div dir="auto"><br></div><div dir="auto">to be honest I newer heard about HTL vs LTH when it comes to BDs....</div><div dir="auto"><br></div><div dir="auto">I found some ASUS  drive in my city, so *may be* I'll have some means to test real disks in new year.</div><div dir="auto"><br></div><div dir="auto"><br></div></div></div>