HDD performance is slow in ubuntu

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http://askubuntu.com – I am running ubuntu 12.04(32 bit). Suddenly after a reboot my laptop did not detect HDD. After couple of restart it failed to detect HDD. Then i change sata mode to IDE from AHCI in BIOS. Then it detect HDD again. And now HDD performance is very slow. I run a short test in disk utility. It shows no error or warning. Model=TOSHIBA MK3259GSXP, FwRev=GN003J, SerialNo=61OJC86CT Config={ Fixed } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=625142448 IORDY=on/off, t (HowTos)