さくらのクラウド　ベンチマーク

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :   982.886 MB/s
          Sequential Write :    73.322 MB/s
         Random Read 512KB :   273.693 MB/s
        Random Write 512KB :    56.439 MB/s
    Random Read 4KB (QD=1) :    28.452 MB/s [  6946.3 IOPS]
   Random Write 4KB (QD=1) :     1.813 MB/s [   442.6 IOPS]
   Random Read 4KB (QD=32) :    49.238 MB/s [ 12021.0 IOPS]
  Random Write 4KB (QD=32) :     4.756 MB/s [  1161.0 IOPS]

  Test : 1000 MB [C: 25.1% (10.0/39.9 GB)] (x5)

同居人の影響もあると思うので、あくまでも参考程度に。