I used to have two IDE disks, cloned them to the new SATA drives (WD500AAKS-00YGA0), threw out the IDE disks and booted on the SATA disks. Worked like a charm. For a while. Now everthing is slow as slow can ever get. (That is, everything that has to do with reading/writing to and from the disks. Browsing goes fine, as does for example playing WoW, though the load times are extreme). Here's the result of the SiSoftware Sandra Benchmark test Drive Index : 1522 kB/s Results Interpretation : Higher index values are better. Random Access Time : 13 ms Results Interpretation : Lower index values are better. Performance Test Status Run ID : PWKS1 on 17. desember 2007 at 19:35:14 Platform Compliance : Win32 x86 System Timer : 3.6MHz Use Overlapped I/O : Yes I/O Queue Depth : 4 request(s) Block Size : 1MB Volume Information Capacity : 466GB Detailed Benchmark Results Speed at position 0% : 1508 kB/s (98%) Speed at position 3% : 1529 kB/s (99%) ****snip**** Speed at position 97% : 1505 kB/s (98%) Speed at position 100% : 1530 kB/s (99%) Random Access Time : 13 ms Full Stroke Access Time : 11 ms Physical Disk Model : WDC WD5000AAKS-00YGA0 Version : 12.01C02 Rotational Speed : 5400rpm (estimated) Removable Drive : No Queueing On : No My mainboard is a MSI RS485-SB600 with ATI 48X ICP chipset and has 2 GB RAM installed on it. The CPU a AMD Athlon 3000+. BIOS : 07/28/2006-RS485-SB600-6A666PRQC-00. OS is Windows XP Pro SP2. So, can anyone please tell me that I'm blind, and that there is an obvious explanation to this problem, preferably one that doesn't involve me buying a new motherboard or something like that? I've also experienced som high pitched sounds from the WD disks, is this normal?