Hi all, I've got a bit of a problem with my PC at home... its not a major issue really and I can make do with it, but I'm sure in a month or two I'll be tearing my hair out over it (and being a male at the age of 22 (and living with 4 females)... I'm starting to get less and less to tear!). First of all... my hardware spec Intel P4 2.4GHz 533fsb 1024Mb (2x 512Mb) PC2700 DDR Gigabyte GA-8PE667 Ultra Soundblaster Live Value PCI Leadtek gf4 ti4200 8x AGP 40Gb Seagate Barracuda IV (ata100, 7200rpm) 80Gb Maxtor (unsure of exact model - its a diamondmax I think - ata133, 7200rpm) 48x LG CDRW 16x Pioneer DVD105s DVDROM 4x Pioneer DVR106d DVDRW secondly... my problem I recently changed my drives around in my system before doing a complete clean install of WinXP SP1. They were originally set as: Primary Master: 40gb seagate Primary Slave: cdrw Sec Master: dvdrom Sec Slave: dvdrw Promise Channel 1 master: 80gb maxtor I changed them to this: Primary Master: dvdrom Primary Slave: cdrw Sec Master: none Sec Slave: dvdrw (couldnt get to the jumper to change to master - not much room as its near psu) Promise Channel 1 master: 40gb seagate Promise Channel 2 master: 80gb maxtor Anyway, since the reinstall, I've noticed that when the 40gb is accessed, my mouse (intellimouse optical usb) goes jittery and sound tends to jump a bit too. All that just to say my sound is jumpy and my mouse is jittery! So to cut a long story short... can anyone give me any advice to help solve this? I have to admit, the system itself runs quicker with both HDDs on the promise controller... but if I'm moving the mouse while the HDD is being accessed (usually has to be accessed a fair bit... more than loading Outlook anyway) it goes jittery, and if I'm playing mp3s or anything, they jump slightly. So if possible, I'd like to keep both HDDs on the promise controller. I've already tried the CDRW on the promise controller in the past to keep the 40gb at least on its own cable on primary IDE, but the cdrw ran garbage (due to the ata controller not being good with atapi functions). So then... if anyone can help, its appreciated thanks in advance.