What means "Calibration retry count"

[ozzyboy]

Last week I did some tests on my new 2,5" hard disk, Samsung HM641Ji, with HD Tune 4.6 and it show me some WARNING on section Calibration retry count(you can see the pictures). Today I ran it again HD Tune and I noticed a change... Calibration retry count is rising!

Now, I want to know if I should worry about this or I can live with this warning!!

Thx!!

Edited December 8, 2010 by ozzyboy