Recording issue

I have a new issue with recording that must be down to the hard disk. If you have 2 consecutive recording and they overlap which they do if you take the default padding settings, both recording stutter during the overlap period and the blue circle appears in the top left while the 2 recordings are happening at the same time. The HDD is a usb powered usb 2 hard disk. Is it down to me using a usb powerd HDD, as anyone else had this?
 
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