RE: Difference between Primary and Secondary IDE Channels?
- From: BAR <BAR@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 14 Apr 2005 04:09:16 -0700
Most peripheral devices generate interrupts in order to receive service from
the operating system (OS).
Some examples of devices that can use interrupts are Hard Disk Drives, PC
cards, onboard timers, audio input devices, keyboards, touch screens, and
pointing devices. Nearly any type of peripheral device might use interrupts
as the principle method of initiating servicing actions by the OS. Because
these peripheral devices can cause or signal interrupts, their device drivers
must process interrupts in order to service their devices.
Physical interrupts (IRQs) are hardware lines over which devices can send
interrupt signals to the microprocessor. Logical interrupts (SYSINTRs) are a
mapping of the IRQ, which the OAL specifies.
The primary IDE interface will be assigned a higher priority than the
secondary, if there are two identical devices on each: but if the secondary
has a Hard disk drive and the Primary only an optical drive, then the
Secondary [hard disk drive] will be given a higher level of interrupt.
"Peter" wrote:
> Hi,
>
> Usually you should connect the Hdd to Primary IDE channel as Master and the
> Optical drive to Secondary IDE channel as Master. Both drive jumpered as
> master or cable select.
>
> Always connect the fastest drive as master and the slower drive as slave in
> the same IDE channel.
>
> For best performance, I would suggest you to use the 40 Pin 80 wires
> shielded IDE cable for both drives; jumper both drives as cable select.
>
> Peter
>
>
> "Michael Reed" wrote:
>
> > Is there any difference between the primary and secondary IDE channels? I
> > have my harddrive on secondary and my DVD 16X burner on primary. I tried
> > this because when I put my DVD burner on secondary it would only get
> > Multi-Word DMA mode 2 while the HDD got UDMA mode 5 on the primary. This is
> > a new burner and capable of UDMA 4. After troubleshooting I switched
> > channels and got UDMA mode 4 on the DVD burner when on the primary as master
> > and still got UDMA mode 5 on the only HDD on the secondary as master. I
> > don't understand the difference and the computer works fine and it appears I
> > am getting the transfer modes I am supposed to.
> >
> >
> >
.
- References:
- Difference between Primary and Secondary IDE Channels?
- From: Michael Reed
- RE: Difference between Primary and Secondary IDE Channels?
- From: Peter
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