where can a beginner become familar with this lingo? On Sun, Apr 25, 2010 at 10:25 AM, Johnson Lam <john...@tmfc.net> wrote:
> On Sun, 25 Apr 2010 15:16:14 +0200, you wrote: > > Hi Bernd, > > >To make a long story short: Jack R Ellis has had a number of drivers > >developed for access to optical units and discs, most of this software > >has sourcecode available. His latest is UIDE.SYS which should support CD > >drives also on Serial-ATA (possibly in AHCI-mode, or just IDE-emulation). > > UIDE have no AHCI support, only "Native IDE" or "Legacy IDE" > supported, I've asked him the reason, his answer below: > > [quote begin] > > UIDE does benefit from usually having a LOT of "rotational > latency" time, between disk transfers, so the next transfer will be > set up and begun long before the disk can "rotate" back to the first > sector of that new transfer. > > AHCI tries to "help" with this by "chaining" disk commands, so when > one disk command ends, the next in the "chain" can be begun without > the disk driver needing an interrupt or more processing. However, > AHCI requires "asynchronous" I-O, like Windows uses, NOT "one at a > time" I-O like DOS uses. So, I doubt AHCI will ever see a lot of > use under DOS -- I see no reason for it in UIDE, and I think other > disk-driver writers will probably feel the same. > > [quote end] > > > Rgds, > Johnson. > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freedos-devel mailing list > Freedos-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-devel >
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