ATA/100 IDE Bus Speed Question [bus speed] [atapi]
Q: Hey everybody. I hope I put this in the right forum.
I together a new machine recently and now have the ability to do ATA/100. I have only one device (hard disk) can do ATA/100, while others say they are or ATAPI Ultra DMA 33 (citation and they do not speed) Ive done a TON 0.
find information about the mixing of devices with different speeds on an IDE channel. Some sites say the whole channel slows the speed of the slowest device. Other sites claim that the speed of the slowest device only comes into play when data between two devices on the transfer of the same IDE channel.
I m find the hard drive and a Kenwood CD-ROM (72x) on same IDE channel. The Kenwood is assessed on Ultra DMA 33 and the IBM ATA/100 hard drive. If the hard drive puts the data in memory, the store at 33 or 100?
Hopefully this makes sense.
Thanks again! 977 503: confused:
PS: I understand that the 33 and 100 burst speeds are not constant, and SCSI. Has anyone seen a big improvement from 33 to 66 100?
Re:"Ok, thanks for the info!
I'll also go try to find a copy of HDTach and do some benchmarking."
Head on to TCDLabs (http://www.tcdlabs.com/) to get your copy of HD Tach.
If you have an ATA/100 hard drive, ATA/100 compatible cables and an ATA/100 controller or ATA/100 compatible motherboard, then you are all set. If you have other hard drives using older transfer modes such as ATA/66 or ATA/33 (you can call it Ultra DMA/66 or whatever you want), they will simply run at that speed.
If you're copying a file from HD 1 to HD 2, obviously it will only be as fast as HD 2, since HD 2 can't transfer as fast as HD 1 (assuming HD 1 is ATA/100 and HD 2 is ATA/66 or 33).
Hope I've helped some, and didn't confuse you. :Q
-guy
Re:If the devices that you are mixing support DMA, either DMA or UDMA then you should see no performance loss. If any device is PIO then the controller will run all devices PIO mode.
Re:Ok, thanks for the info!
I'll also go try to find a copy of HDTach and do some benchmarking.
Re:why not run some benchmark to test it
get HDTach and look at the burst rate of your HDD when it is by itself, and then with the CDROM
Re:This is my understanding, but I'm not 100% sure:
You can run any combo of ATA33/66/100 on same channel, all at max-rated speeds, but can have probs with DMA + non-DMA devices on same channel.
Again, not positive.
Related posts
Tags: atapi, bus speed