SATA Drive is very slow Tags: Hard Drives SATA CPUs Storage Last response: February 20, 2006 7:35 PM in Storage Share SuperStruct February 20, 2006 7:07:27 PM I have 2 hard drives that are the same exact brand and size (Seagate SATA 250GB ). One of them is being VERY slow. I ran HD Tach on both drives and I received the following results: ---Normal Drive--- Random Acces: 15.6ms CPU Utilization: 4% Average Read: 56.1 MB/s ---Slow drive--- Random Acces: 15.2ms CPU Utilization: 100% Average Read: 3.7 MB/s When I am transferring files to/from this drive, my computer slows down almost to the point of being completely frozen (I can't even see the mouse because the CPU is being used from the drive I/O!) Here's my question: Is this a problem with the hard drive, the serial cable, or the motherboard? How can I troubleshoot this problem? More about : sata drive slow Codesmith February 20, 2006 7:35:09 PM Check to see what DMA transfer mode is being used. It could be using PIO mode which is very slow. You can manaully lower the speed, but excessive comunication errors will also automatically downgrade a device. My external SATA enclosure uses an extra long SATA cable and often it gets kicked down to PIO mode. Swap ports and cables with the fast drive, then run a full diagnostic on the drive. Use Seagates Online Tools. Also check the smart status. Obviously if the test indicate problems you RMA the drive. If the drive is slow but passes the test, you should talk to Seagates technical support before RMA's the drive. Always fully test all new drives. Never assume they work. You never know how many times the box was dropped before reaching your door or the store shelf. Can't find your answer ? Ask ! Publish Related resources Solved6gb sata drive very slow Forum Very Slow 320Gb SATA 300 drive Forum SolvedPCI-e SSD very slow, close to SATA 2 SSD speeds. Forum Solved1TB Toshiba External Drive loading very slow/possibly corrupt Forum SolvedVery slow hard drive and gaming Forum SolvedWD External Hard Drive Usb 3.0 randomly disconnecting and very slow transfer rate Forum SolvedCD-DVD Drive Running VERY Slow & Other Problems Forum Computer very slow after wiping hard drive and doing a fresh install of Windows 7 Forum 1TB External Drive very slow, can't play movies. Forum PNY XLR8 SSD Drive - Very slow benchmark Forum Hard drive became very slow Forum I bought a western digital internal hard drive for my windows 7 64 bit OS now the speed is very slow when compared to my previ Forum dvd drive reads iso very slow & stucks Forum SolvedWhy are my SATA hard drive transfer rates so slow? Forum Very slow SATA. Forum SolvedInstalled a third hard drive and computer is now very slow Forum SolvedIDE to SATA DVD Drive Causes Slow Windows Boot Forum SolvedSecond hard drive very slow Forum SolvedSlow SATA Drive when playing games Forum SolvedWill a SATA I (1.5) dvd rom slow my sata III (6GBs) hard drive to 1.5? Forum More resources Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !