AHCI:

fio random-read-test.fio
random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
Starting 1 process
random-read: Laying out IO file(s) (1 file(s) / 128MB)
Jobs: 1 (f=1): [r] [99.4% done] [1,559K/0K /s] [380/0 iops] [eta 00m:01s]
random-read: (groupid=0, jobs=1): err= 0: pid=1919
  read : io=128MB, bw=756KB/s, iops=189, runt=173315msec
    clat (usec): min=5, max=129K, avg=5278.20, stdev=3822.30
    bw (KB/s) : min=  293, max= 1639, per=99.69%, avg=753.69, stdev=92.07
  cpu          : usr=0.00%, sys=0.01%, ctx=32792, majf=0, minf=84
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued r/w: total=32768/0, short=0/0
     lat (usec): 10=0.02%, 250=0.01%, 500=18.71%, 750=2.47%, 1000=0.71%
     lat (msec): 2=0.83%, 4=14.77%, 10=55.47%, 20=6.61%, 50=0.39%
     lat (msec): 100=0.01%, 250=0.01%

Run status group 0 (all jobs):
   READ: io=128MB, aggrb=756KB/s, minb=774KB/s, maxb=774KB/s, mint=173315msec, maxt=173315msec

Disk stats (read/write):
  sda: ios=32644/283, merge=0/2139, ticks=173510/18206, in_queue=191739, util=100.00%

ATA:

random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
Starting 1 process
random-read: Laying out IO file(s) (1 file(s) / 128MB)
Jobs: 1 (f=1): [r] [98.9% done] [1,270K/0K /s] [310/0 iops] [eta 00m:02s]
random-read: (groupid=0, jobs=1): err= 0: pid=2983
  read : io=128MB, bw=741KB/s, iops=185, runt=176870msec
    clat (usec): min=272, max=94,530, avg=5386.82, stdev=3591.16
    bw (KB/s) : min=  316, max= 1612, per=100.02%, avg=741.15, stdev=95.20
  cpu          : usr=0.00%, sys=1.92%, ctx=33049, majf=0, minf=36
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued r/w: total=32768/0, short=0/0
     lat (usec): 500=18.79%, 750=1.43%, 1000=0.61%
     lat (msec): 2=0.73%, 4=14.09%, 10=56.36%, 20=7.80%, 50=0.18%
     lat (msec): 100=0.01%

Run status group 0 (all jobs):
   READ: io=128MB, aggrb=741KB/s, minb=758KB/s, maxb=758KB/s, mint=176870msec, maxt=176870msec

Disk stats (read/write):
  sda: ios=32662/172, merge=0/2116, ticks=176491/22935, in_queue=199454, util=100.00%