… And Don’t Forget Win2K/NT

Although fewer LangaList readers use Windows 2000 and NT than use Win98, the Win2K/NT crowd tend to make up in savvy what they lack in raw numbers. 8-) Here’s a sample of what Win2K-using readers dug up about DMA on their systems:

Perhaps the easiest way to examine DMA access in NT (and who knows, maybe in other OS’s as well) is to get DMACheck from MS… http://support.microsoft.com/support/kb/articles/Q191/7/74.ASP — Ed

I recently finished building my first PC for home and ran into some problems with DMA on ATA100 HDD’s. I run 2 Maxtor 7200RPM ATA100 Hard drives. Device manager always showed the drives to be in PIO mode. Finally, searching thru MS knowledge bases I found http://support.microsoft.com/support/kb/articles/q269/5/55.asp This article explains the problem and gives some information on contacting MS for a hotfix ( http://support.microsoft.com/support/kb/articles/Q260/2/33.ASP )that is due with SP2. The Plus edition is great. Glad I signed on.—Ben Turner

I was reading your latest newsletter on DMA when I remembered an extra step I had to do when setting up my win2k machine. UDMA66 mode, with intel chipsets, is disabled by default and requires an edit to the registry to use. So just choosing enable DMA when available will not mean you’re gonna get UDMA66 mode. Here’s the MS knowledge base http://support.microsoft.com/support/kb/articles/Q247/9/51.ASP —Ben Driskill

Reader William Robison found these troubleshooting links helpful:

Clarification of Enhanced IDE under Windows NT 4.0 – Q152307

Stop 0x0000000A in Atapi.sys (Post SP2) with DMA Enabled – Q174232

STOP 0x0000000A or Difficulty Recognizing IDE CD-ROM Drives – Q177257

How to enable / disable IDE DMA Bus-Mastering using ATAPI.SYS – Q158873

Thanks, guys!

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Fred Langa

About Fred Langa

Fred Langa is senior editor. His LangaList Newsletter merged with Windows Secrets on Nov. 16, 2006. Prior to that, Fred was editor of Byte Magazine (1987 to 1991) and editorial director of CMP Media (1991 to 1996), overseeing Windows Magazine and others.