Writes to my WD Caviar Green 2TB hard drive are exceedingly slow. When dpkg is setting up packages atop reports speeds of between 0.5 and 1 MB/s. AHCI is enabled in my bios. I bought the drive new. What could be wrong? What can I do to troubleshoot?
This is on Ubuntu 11.10. 3 partitions are 1%, 5% and 50% used respectively.
edit: I had originally misidentified the drive as my SSD drive but later found my mistake when running a benchmark to troubleshoot.
edit2: File system is btrfs.