QUES: Measurements approx width 4 cm

correct the punctuation.

CORRECTED: Measurements: approx. width 4 cm

QUES: It is just invisible to you the operating system just removes all its entries from the computer and marks the memory as free But it is also true that the deleted file still remains on its original location until it is not overwritten

correct the punctuation.

CORRECTED: It is just invisible to you; the operating system just removes all its entries from the computer and marks the memory as free. But, it is also true that the deleted file still remains on its original location until it is not overwritten.

QUES: Heinrich married Corinna von Elmendorff on 08 MAY 1999 in Lechenich Corinna was born on 12 NOV 1967

correct the punctuation.

CORRECTED:
Heinrich married Corinna von Elmendorff on 08 MAY 1999 in Lechenich. Corinna was born on 12 NOV 1967.