High %wa , but iotop shows low disk usage

Hello,

im running rsync with --bwlimit 10000 and i have around 20% "%wa" value when doing "top" linux command.

But when im monitoring io by "iotop" i see average read rate 150Kb/s and writing around 2Mb/s. Rarelly its writing 20Mb and i seen even 40Mb (rare)

Im curious why there is %wa value so high when disk full writing/reading speed is used from around 20% only according to iotop?

disk is: TOSHIBA DT01ACA200 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com

smartctl -a /dev/sda is without errors.

thx

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