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what's the disadvantage of slave a IDE device??

J

j@cko

Diamond Member
I read the post on KT7-RAID, the person wants to have 4 chaneel IDE, but do not want to slave any of devices, what's the disadvantage of slaving?? Or it's just personal perference??
 
I'm pretty sure they CAN be accessed at the same time, it's just that the performance will decrease rather than if you had drives on separate channels. And generally, master is faster than slave
 
Nope. ElFenix is right. Only one device per IDE channel can be accessed at one time.

Edit: The difference between master and slave is that if both try to use the IDE bus at the same time, the Master gets precidence, and the slave waits for it's turn.
 
Oh well I once tranfered files between hard drives on the same primary IDE channel so I must be dreaming 😕
 
im using just ide1 and ide2 on my kt7-raid since highpoint controller sucks so bad.

ide 1 has one of my harddrives which is master, (the boot drive) and my other drive is slave (mp3s, storage)

I tried to copy a 100mb file from 1st harddrive to 2nd harddrive but it was VERY SLOW!! So you CAN transfer between the master and slave..just very slowly

ide 2 is cdrom ofcourse

wish i had more ide slots without the gosh danged highpoint unstable crap. might get a asus board.
 
madcowz-
Nope, you're not dreaming... you're just not capable of watching fast enough to see a several-millisecond pause between accesses! When two devices on the same channel "talk" to each other, it's a half-duplex conversation (to coin a mangled phrase!)- one talks, then shuts up while the other talks back. They do this many times a second. SCSI devices can talk and listen at the same time, which is one advantage they have...

LevcoS
 
Levcos is right. Only 1 device at a time per channel. But its so fast you might not even notice it. Like having 2 applications running at the same time. They dont both have access to the cpu at the same time it switches back and forth by priority.
 
madcow you can transfer files between master and slave but they take turns accessing the channel read drive puts data into drive cache and ram and when the drive cache and ram are full the data is written to the destination drive and this process is repeated untill the transfer is compleat, if the drives had been on sepearte channels the process would have been much the same only read and write functions could have been preformed at the same time.
 


<< What about if your using an Ultra 80-way cable on ATA 33 or higher? >>

Doesn't make a difference. It's not the cable or the interface speed. It's the design of the IDE system.
 
Hmmm....On not being able to use 2 devices on the same chain at the same time - Explain this:

I have my CDRW as Primary Master and my DVD as Primary Slave. While I am burning MP3's to Wav to CD, I watch DVD's. Are you telling me that the duplexing is so fast that I can't tell? Especially with the DVD which doesn't skip a beat, nor the burner.

Enlighten me.

LJ
 
larry joe, the mp3s are going from a hd on another channel of the sba+4 right?, well if you can pull off that much stuff at once, it's mainly due to your processor there, yeah the processor is helping out alot , i've got the same board, and i can play mp3s off one hd while duppying a cd from primary ide to secondary, but i dont see how you could burn and play a dvd, off the same channel
 
Well, I guess it must be the bus mastering. Yes, I burn mp3's from a HD on the HP ATA66 controller to the CDRW on the same chain as the DVD and the movie plays perfect and the CD burns are perfectly.

Not patting my self on the back, but my set-up does rock. Out of all the systems and configurations I have had, this batch of hardware is sweetest. I am coming up to a full year with a the same install of 98SE. The system runs so well, I am not even the least bit tempted to upgrade the CPU/mobo.

LJ
 
Damn... sweet thread, learned a helluva lot today from reading this thread... thanks guys... I love this forum.
 
My 2 cents,

I do believe that its ONLY the actual data transfer that can not happen concurrently. Other commands can be executed concurrently.
 
What if I have all my drives on different channels and they are all slave????
Am I going to die? :Q NOOOOooooooo....

Sorry, I feel kinda weird today...
 
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