Code:
> cat tt1
00:52:32,disk2000,0.01,0.50,0,0,0.00,1.31
00:52:32,disk2001,0.00,0.50,0,0,0.00,0.53
00:52:32,disk2003,0.00,0.50,0,0,0.00,0.78
00:52:32,disk2008,0.02,0.50,0,0,0.00,5.85
01:01:59,disk30,2.57,14.58,8,125,38.78,11.19
01:01:59,disk50,2.96,13.54,9,131,36.71,11.47
01:01:59,disk745,0.00,0.50,0,0,0.00,0.66
01:01:59,disk746,0.02,0.50,0,0,0.00,10.58
01:01:59,disk747,0.02,0.50,0,0,0.00,9.47