Re: DMA mode

From: Nathan McNulty (nospam_at_msn.com)
Date: 08/06/04 

Date: Fri, 06 Aug 2004 09:57:50 -0700

I have a couple things to interject. First, the current transfer rate
may be at DMA 5, but the maximum is DMA 6. Windows will move up when
the bandwidth is required. Use a program such as Everest Home from
www.lavalys.com to find out what it is really doing (under hard drive
section). Second, PIO mode will work for some CD ROM drives and
Burners, but it is not a good idea to have a DVD ROM or DVD Burner on a
PIO Mode since they are capable of much more data throughput. Change to
DMA Mode if possible in either case. What exactly are your optical drives?

Also, do note that unless using RAID, you will never come close to
ATA100 speeds much less ATA133 ;) 

----
Nathan McNulty
JustUs wrote:
> "Bob Willard" wrote:
> 
> 
>>dferron wrote:
>>
>>>I have a Maxtor 133 drive. WinXP will not recognize it as 
>>>a DMA mode 6. I have a VIA chipset. Have followed MS 
>>>instructions to update the drivers. No change. Auto 
>>>detect is grayed out. Also the second device auto detect 
>>>is grayed out as well. Secondary channel is the same. 
>>>Help?
> 
> 
> 
>>If you are getting Mode 5 (U/100) instead of mode 6, be happy.
>>There would be no difference in performance, because the STR
>>of that HD is way less than U/100 and so will not be
>>bottlenecked by U/100.
>>-- 
>>Cheers, Bob
>>
>>
> 
> In response to both replies:
> My BIOS does support Mode 6 and I do have the UDMA cables.
> 
> If the drive is rated at 133, why the problem? Is this one of those specs 
> like HP printers "23ppm"? Of course that is with only one word on the page 
> kind of thing
>  :-).
> 
> My question would be then: Does XP know that the best xfer rate is at 
> ATA100, therefore not allowing the mode 6? Also, my optical drives are PIO, 
> and I understand that this is OK as they would never get to the DMA specs.

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