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IDE devies on same channel

L

LuDaCriS66

Platinum Member
Isn't it true now that if you have an ATA33 device with an ATA 100 drive on the same channel, that each device will run at their own speed instead of the slowest device? I know that it used to be where they would both run at the lower speed.
Well.. this is at least what I've been told here on AT.

Anyone have a link or something to prove this?
 
Originally posted by: LuDaCriS66
Isn't it true now that if you have an ATA33 device with an ATA 100 drive on the same channel, that each device will run at their own speed instead of the slowest device? I know that it used to be where they would both run at the lower speed.
Well.. this is at least what I've been told here on AT.

Anyone have a link or something to prove this?
Click to expand...

older controllers only allowed the slowest protocol of the channel to be applied to the channel, but modern ata controllers allow both devices to work at their current speeds. however, recall that ata specs only allow one device per channel to be active at any time. the problem with that is, if you want to transfer files between 2 devices on the same channel, it has to go to the device into memory and then into the other device. the effective speed will be slower than the slowest protocol on the same channel. there is a caveat. if both device are active, more often than not, the slowest protocol is applied to both. you dont really notice this though, since your system will slow to a crawl.
 
Originally posted by: LuDaCriS66
Isn't it true now that if you have an ATA33 device with an ATA 100 drive on the same channel, that each device will run at their own speed instead of the slowest device? I know that it used to be where they would both run at the lower speed.
Well.. this is at least what I've been told here on AT.

Anyone have a link or something to prove this?
Click to expand...
You can find information over at stoagereview but most modern IDE controllers support "independant device timing" thus mixing ATA33 devices and ATA66/100/133 (assuming the proper cabling is used) shouldn't affect each other. The only exception to this is if you have a device (an older optical drive for example) running in PIO mode.

Thorin
 
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