"Bechmarking the write-rate of a disk requires exclusive access to the disk "
"(e.g. the disk or its partitions cannot be mounted or in use) and involves "
"reading data and then writing it back. As a result, the contents of the disk "
"is not changed.\n"
"\n"
"If not checked, the write-part of the benchmark will not be done but on the "
"other hand exclusive access to the device is not needed (e.g. the disk or "
"device can be in use) ."

At the beginning of the string, the word benchmark is lacking an 'n'. Also there is an unneeded space character before the final period.