drag and drop
Drag and drop from computer to hard drive or vice versa used to default copy files. Now it DELETES THEM from the original source. This is a dangerous bug. WHATS GOING ON? IT DIDN'T USED TO WORK LIKE THIS.
The mentioned issue is fixed in the latest patch release #220.127.116.113, Please install and confirm if that fixes the issue.
You can refer the issues fixed in the patch @ https://helpx.adobe.com/bridge/kb/fixed-issues.html