I have a new 3TB WD Red drive. I put it in my FreeNAS box and ran the following commands
dd if=/dev/zero of=/dev/ada0 bs=65536 &
dd if=/dev/ada0 of=/dev/null bs=65536 &
with a little time in between.
After ~14 hours, I got the results:
dd: /dev/ada0: short write on character device
dd: /dev/ada: end of device
45785416+0 records in
45785415+1 records out
3000592982016 bytes transferred in 53383.254357 secs (56208506 bytes/sec)
I guess I never really worried about the output of the dd command when copying drives. I guess I was expecting both records in and out to end with "+0". Can someone explain my results and let me know if the results throw up any red flags?