First, growisofs is a program that was maintained between late 2002 and 2007, do not expect to get help with this command today. Growisofs is known to fail with some drives that are picky with interpreting SCSI commands.
There is a way to read the capabilities of the drive using:
cdrecord -prcap (add a
dev= parameter only if you have more than one drive)
but this is just what the drive supports
There is a way to read the media information via:
cdrecord -minfo -v
But this just prints the media specs.
What you get from the drive/media combination is not easily retrievable from the drive. A possible way to go is to is to do a dummy write in verbose mode:
cdrecord -dummy -v xxx.iso
and check the speed you get. WARNING: dummy writes are not implemented in the drive for DVD+ media.
Be sure not to use the fake cdrtools you get on Debian, RedHat and similar but use recent original software. All programs from the original suite support the
-version option and print a version >= 3 since 10 years. The current version (summer 2015) is 3.01 with no "a##" added.