CD drives disappeared after enabling DMA
i was fooling around on my old computer which has two old cd drives. i stupidly enabled DMA on them, and now after rebooting windows 98 does not see the cd drives at all :(
in device manager, i see a yellow ! for secondary IDE controller (dual fido). i think that's where the problem is. i can't turn DMA back off (pretty sure the drives don't support it now), because i can't see the CD drives in device manager anymore. what should i do?
'Extra' to what you've been told so far ..
Quote:
Originally Posted by romelus
..(pretty sure the drives don't support it now)..
Tell me/us the exact models & we can tell you ;) (also tell us about any harddrives too please as that's part of the 'sum' I 'waffle about' below ;))
Pretty much every drive now is dma capable 'somehow' - but there's lots of complications like IDT (independent device timing - that's when drives can or can't run at different speeds on the same channel) & also there's the differences between MW-DMA & UDMA (Multiword & ultra) which is to do with the 'size' of data sent to & from the unit & then loads more complications about what works 'good' with what ..
& then to cap it all off you've got 'switch down' drivers going 'wappy' too ! (Many IDE & atapi drivers for many controllers are able to support IDT by sensing how 'well' data is transfered & switching the drives speed up or down through all the various DMA & PIO {programmable Input/Output} modes - sometimes {infact frequently} this doesn't quite work as 'intended' !)