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DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/17/2004 4:09:39 AM   
sulfur

 

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Hi all I'm using 2.C8 but I dont' think it matters.

Why does DVDInfoPro show the Drive Interface is ATAPI-3? Shouldn't it be ATAPI-4???

ATA/ATAPI-3 is DMA2 (not UDMA2) which has a max transfer rate of 16Mb only!!!

ATA/ATAPI-4 is UDMA2 and is at 33Mb!

After weeks of experiment, I am 99% sure this is what is tricking my enclosure to function at 16Mb max transfer rate! I have mentioned before using the same enclosure I can get 33Mb with a Seagate HD, but not with the NEC 3500.

For ATA/PIO/DMA/UDMA ref see here
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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/17/2004 1:33:06 PM   
emperor


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Have you installed the drive as internal or external?

(in reply to sulfur)
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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/17/2004 2:59:18 PM   
sulfur

 

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External in an enclosure. I am guessing internal setup is smart enough to figure out the drive is ATAPI-4 (33Mb/s UDMA2), but my enclosure took the NEC's drive signature for granted & chose to set its speed only at ATAPI-3 (slower 16Mb/s DMA2).

Maybe the firmware(s) is the problem. Even the pic you posted earlier says ATAPI-3!

See this thread of yours

(in reply to emperor)
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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/17/2004 3:20:41 PM   
emperor


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Ok, now i understand, i think its normal that DVDInfoPro shows a different value tha UDMA4, many external USB/Firewire cases may not give absolute performance (16X reading/writing)

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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/17/2004 6:12:23 PM   
Spaceentity

 

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My newly installed internal 3500 is showing ATAPI-3 also using DVDInfoPro 3.27. I am using WinXP with Ultra DMA mode 5.

(in reply to emperor)
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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/19/2004 5:16:18 PM   
dkcho

 

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Mine shows the interface is ATAPI-50. Does anyone know the difference ?

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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/19/2004 6:11:41 PM   
nicw


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This info comes from the drive. Its shows the atapi version command set that drive states it supports. where ATAPI-50 is V5.0 etc. Don't confuse this with the speed of the interface.


< Message edited by nicw -- 10/19/2004 6:13:26 PM >


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RE: DVDInfoPro shows NEC 3500 with ATAPI-3? - 10/20/2004 9:54:16 PM   
dkcho

 

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I see. If I use ASPI driver in DVDInfoPro, it shows ATAPI-50 but if I use SPTI driver, it shows ATAPI-3.

(in reply to nicw)
Post #: 8
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