python random read disk

gistfile1.py

import random
import time
size=100000000
t1 = time.time()
f=open('x.db','wb')
f.write('x'*size)
f.close()
print 'write:', time.time()-t1
f=open('x.db','rb')
t2=time.time()
for i in xrange(10000):
        pos=int(random.random()*size)
        f.seek(pos)
        f.read(1)
print 'random read:',time.time()-t2