CyanogenMod/android_system_vold — comment on commit a28056b38275003895ff5d9576681aca01544822
File:  line 0
By worstenbrood:

On a HTC Desire, setting the ratio to 0 this gives really poort transfer speeds (class 4, write, 700 kb/s), while setting this back to 20 or even more (50) gives fast speeds without influencing the ui responsiveness !