With measurecopy one can determine how long it takes to write data to a device.
This can be interesting for spinning disks systems where writing to the inner circle can use different time than the outer circle.
Myself, I use it to determine how much slower my data de-duplicating software gets when lots of data is in its datastore.
0.1 initial release
Example of writing new data to a MyDeDub 0.4 device which was full before the copying started.
x-axis is the number of blocks written, y axis the time it took (in seconds) to store a block.