I'm trying to test an embedded nand flash chip using the dd command (write random data to a file):

```
dd if=/dev/urandom of=/nand/storage/testnand/test.raw bs=100000 count=50 2> /dev/null

```

However, the unit I'm testing is running busybox v1, and it has been patched. The dd command is not recognized. Is there an alternative command that will help me achieve the same results?