This is a simple utility for testing drives. It can start multiple children to test drive access from multiple processes doing a variety of reads and writes. Each child writes a random length block of data to the specified path, and then reads it back, and as the name indicates, it verifies what it reads is what it wrote.

verify <prefix> <count>

From the command line you pass it a path and file prefix to where to create files (i.e. if the drive you want to test is mounted on /mnt, you could use /mnt/test as prefix). You also specify the count of children. If you wish to use verify’s timing feature to test drive speed, use 0 for count.