Problems with external DVD burner
in [Computers]
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From: The Doctor on 15 Dec 2008 13:50 steam3801 <tryspammingthis(a)ozemail.com.au> wrote in news:f45ck4lgl9ednh6ns5q4m4t99trvm04sea(a)4ax.com: > On Sat, 13 Dec 2008 01:20:20 GMT, The Doctor <doctor(a)nospam.com> > wrote: > >>Don McKenzie <5V(a)2.5A> wrote in news:6q376mFagthhU1 @mid.individual.net: >> >>> The Doctor wrote: >>>> Hi all, >>>> >>>> I have an Omni DVDR528. When I powered it up, the drive door doesn't >>>> open. Also recognition by XP or Linux is intermitten. >>>> >>>> Any idea? >>>> >>>> Thanks in advance >>> >>> Power! >>> >>> Do you have a power lead as well as a data led plugged in? >>> Don't use a hub for power. May not be wise to use one for data if it >>> is marginal. >>> >>> Don... >>> >>> >> >>Thanks Don, I definitely have power. Otherwise, I wouldn't be seeing the >>LED lighting up. The connector is a bit funny though. > > Not what was asked, and not answered. Sorry for the confusion but it is an external DVD burner and it does have an *external* power supply which draws power from the mains not USB. I didn't think an external DVD burner can get enough power from a USB port (even 2 USB ports). > LED doesn't necessarily mean power to run, just simply power. > > What sort of connection? (.e.g. USB?) Does the device have separate > power cords? > > (i.e. some ecterneal HDD have Y USB connectors - one for the bus > connevtion, which may or may not supply enough power to connect AND > transfer data. Something the other USB connection in the Y cable is > required in another USB port to add more power). > -- > steam3801 > Compuglobalhypermeganet Inc. >
From: Don McKenzie on 15 Dec 2008 14:33 > I didn't think an external DVD burner can get enough power from a > USB port (even 2 USB ports). I have a very sweet one I got on ebay from hong kong, about $80AUD inc postage. Has two usb cables, one supplies power, and one data. When you said external DVD, that's the type I thought you meant, sorry. It will run off my 7" and 10" eee pc notebooks using only the data lead. Slimline case, I pack it in my notebook bag. All external DVD writers should be like this now days. Cheers Don... -- Don McKenzie Site Map: http://www.dontronics.com/sitemap E-Mail Contact Page: http://www.dontronics.com/email No More Damn Spam: http://www.wizard-of-oz.com http://www.dontronics-shop.com/super4-usb-relay-module.html
From: Clocky on 17 Dec 2008 17:21 "Don McKenzie" <5V(a)2.5A> wrote in message news:6qnpoaFdoaanU1(a)mid.individual.net... > >> I didn't think an external DVD burner can get enough power from a >> USB port (even 2 USB ports). > > I have a very sweet one I got on ebay from hong kong, about $80AUD inc > postage. > > Has two usb cables, one supplies power, and one data. When you said > external DVD, that's the type I thought you meant, sorry. > > It will run off my 7" and 10" eee pc notebooks using only the data lead. > Slimline case, I pack it in my notebook bag. > > All external DVD writers should be like this now days. > It has two cables to supply power and one doubles up for data. USB port spec rates one port for only 500ma so by doubling up on the ports you can 1A which is more like minimum current draw required for burning DVD's. Running it off one port will likely work but you risk overloading the port and possibly burning PCB traces if they're at marginal spec.
From: Don McKenzie on 22 Dec 2008 01:15
Clocky wrote: > "Don McKenzie" <5V(a)2.5A> wrote in message > news:6qnpoaFdoaanU1(a)mid.individual.net... >>> I didn't think an external DVD burner can get enough power from a >>> USB port (even 2 USB ports). >> I have a very sweet one I got on ebay from hong kong, about $80AUD inc >> postage. >> >> Has two usb cables, one supplies power, and one data. When you said >> external DVD, that's the type I thought you meant, sorry. >> >> It will run off my 7" and 10" eee pc notebooks using only the data lead. >> Slimline case, I pack it in my notebook bag. >> >> All external DVD writers should be like this now days. >> > > It has two cables to supply power and one doubles up for data. Correct. > USB port spec rates one port for only 500ma so by doubling up on the ports > you can 1A which is more like minimum current draw required for burning > DVD's. 1A is correct. Burning DVD's current is incorrect. Sounds like a guess to me. Have you measured the current drawn on one of the tiny DVD external writers? If you don't give them enough power, they simply don't come on line. Same applies to these new tiny, high capacity hard drives, that you can get everywhere now. They are great. > Running it off one port will likely work but you risk overloading the port > and possibly burning PCB traces if they're at marginal spec. I guess you have never heard of "PTC" http://www.littelfuse.com/data/en/Application_Notes/ec616.pdf Positive Temperature coefficient device, which limits the port current. Try putting a short on a USB port. If you don't like the sound of that, try a cheap hub. Cheers Don... -- Don McKenzie Site Map: http://www.dontronics.com/sitemap E-Mail Contact Page: http://www.dontronics.com/email No More Damn Spam: http://www.wizard-of-oz.com http://www.dontronics-shop.com/super4-usb-relay-module.html |