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#101
Something must be off. With SATA II, you should be seeing 200-250MB/s seq.speeds.
After you are finished with setting the partitions, you can go into BIOS and check if there is an option for setting the SATA controller to AHCI or RAID mode? If you are unsure take photographs of the BIOS pages and post here.
Don't change anything in BIOS though!