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Maximum Read Speed/Current Read Speed Difference
Anton wrote:
Fellas: I have an LG DVD-ROM reader and one LG CD-RW burner. I have noticed (in Alcohol 120 and SiSoft Sandra) that the current read speed for both drives is lower than the maximum read speed allowed by both units. The DVD-ROM has a maximum read speed of 48x, but the current speed is 20x (for DVD, maximum is 6x and current is 3x). The CD burner has a maximum read speed of 40x, but now it doesn't specify the current read speed; maximum write speed and current write speed coincide now (24x). I thought the problem was because those channels were using PIO mode instead of DMA, so in the Device Manager I changed them to the option 'DMA if possible' and now they use Ultra-DMA. This may have worked with the burner, because before changing to DMA there was a divergence between the maximum read speed and the current read speed (as I said above, now Alcohol and Sandra only specify the maximum speed [no current], so I pressume it has worked, though I'm not really sure). However, the DVD- ROM's current read speed is still 20x (less than half of the drive's capabilities). How can I regain that performance? I thought that changing the transfer mode to DMA would solve the thing, but there must be something more that escapes to me. The system is a P4 2.6GHz with 512 MB RAM. OS is W2K Professional. The DVD-ROM is -I think- on the primary IDE channel (as slave), and the CD-RW is on the secondary IDE channel (slave too). All the help will be greatly appreciated. Thanks in advance. You could try an 80 wire IDE cable may help. |
#2
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Anton wrote:
Fellas: I have an LG DVD-ROM reader and one LG CD-RW burner. I have noticed (in Alcohol 120 and SiSoft Sandra) that the current read speed for both drives is lower than the maximum read speed allowed by both units. The DVD-ROM has a maximum read speed of 48x, but the current speed is 20x (for DVD, maximum is 6x and current is 3x). The CD burner has a maximum read speed of 40x, but now it doesn't specify the current read speed; maximum write speed and current write speed coincide now (24x). I thought the problem was because those channels were using PIO mode instead of DMA, so in the Device Manager I changed them to the option 'DMA if possible' and now they use Ultra-DMA. This may have worked with the burner, because before changing to DMA there was a divergence between the maximum read speed and the current read speed (as I said above, now Alcohol and Sandra only specify the maximum speed [no current], so I pressume it has worked, though I'm not really sure). However, the DVD- ROM's current read speed is still 20x (less than half of the drive's capabilities). How can I regain that performance? I thought that changing the transfer mode to DMA would solve the thing, but there must be something more that escapes to me. The system is a P4 2.6GHz with 512 MB RAM. OS is W2K Professional. The DVD-ROM is -I think- on the primary IDE channel (as slave), and the CD-RW is on the secondary IDE channel (slave too). If no drive is on the secondary master, move the dvd-rom or cd-rw to it. |
#3
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That value reported may be out to lunch. Have you tried something like
CDSpeed to check the actual transfer rate from the drive? -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from Home Page: http://www.roberthancock.com/ "Anton" wrote in message news:3f26ee96@shknews01... Fellas: I have an LG DVD-ROM reader and one LG CD-RW burner. I have noticed (in Alcohol 120 and SiSoft Sandra) that the current read speed for both drives is lower than the maximum read speed allowed by both units. The DVD-ROM has a maximum read speed of 48x, but the current speed is 20x (for DVD, maximum is 6x and current is 3x). The CD burner has a maximum read speed of 40x, but now it doesn't specify the current read speed; maximum write speed and current write speed coincide now (24x). I thought the problem was because those channels were using PIO mode instead of DMA, so in the Device Manager I changed them to the option 'DMA if possible' and now they use Ultra-DMA. This may have worked with the burner, because before changing to DMA there was a divergence between the maximum read speed and the current read speed (as I said above, now Alcohol and Sandra only specify the maximum speed [no current], so I pressume it has worked, though I'm not really sure). However, the DVD- ROM's current read speed is still 20x (less than half of the drive's capabilities). How can I regain that performance? I thought that changing the transfer mode to DMA would solve the thing, but there must be something more that escapes to me. The system is a P4 2.6GHz with 512 MB RAM. OS is W2K Professional. The DVD-ROM is -I think- on the primary IDE channel (as slave), and the CD-RW is on the secondary IDE channel (slave too). All the help will be greatly appreciated. Thanks in advance. |
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