I have a seagate barracuda 500gb 7200rpm 16mb cache hard drive , and here's the deal ;When i first installed windows , it ran fine , then , a day after , performance dropped to 30mb/s ( read/write ) and the transfer speed were even lower at 3mb/s . I zero filled the drive and installed win7 again . Same thing , only that this time its painfully slow , it randomly freezes , internet speed is affected too topping out at 100-ish kb/s . Temps are normal at 40 degrees Celsius without a fan ( i have removed it , with a fan its like 35 ) and there is no indication of failure or malfunction , either mechanical or logical , not only because I cant recognize any , because seatoolls and HD tune as well as crystal disk info say so . It also seems to run at very fast rpm from times to times ... WTF .
my system specs ;
AMD athlon x4 750k
MSI a75ma-e35 mobo
8gb kingston blu 1600mhz
r7 260x 2GB OC by saphire
500W 80plus cooler master psu
SEAGATE BARRACUDA 500GB SATAIII 3.5'' ST500DM002
corsair carbide spec o2
optical drive
I have been trying to solve this for a month now , and its really getting my nerves , please help . If you need any further information , please let me know
thank you in advance
my system specs ;
AMD athlon x4 750k
MSI a75ma-e35 mobo
8gb kingston blu 1600mhz
r7 260x 2GB OC by saphire
500W 80plus cooler master psu
SEAGATE BARRACUDA 500GB SATAIII 3.5'' ST500DM002
corsair carbide spec o2
optical drive
I have been trying to solve this for a month now , and its really getting my nerves , please help . If you need any further information , please let me know

thank you in advance