I cannot run the dd command on a raw device to test it, I am getting an error message 'dd: writing '/dev/raw/raw1': Invalid argument'. What is wrong?

Raw devices provide direct raw access to sectors on a block device. To write to a raw device using the dd command you need to specify the bs ( block size ) to dd to be an exact multiple of the real devices sector size.

For example, if a raw device is created on a device that has a sector size of 512, the bs value must be an exact multi...