From John McKell <mckellj@iomega.com>:

  This patch for scsi/sr.c and cdrom/cdrom.c persuades
  /proc/sys/dev/cdrom/info to report that connecting a drive via USB
  rather than ATAPI in fact does not make it able to write DVD-R.

  Without this patch, when sr0 and hdd are the same type of device
  connected via USB and ATAPI respectively, I see:

	$ cat /proc/sys/dev/cdrom/info:
	drive name:             sr1     sr0     hdd
	...
	Can write CD-R:         1       0       0
	Can write CD-RW:        1       0       0
	Can read DVD:           0       0       0
	Can write DVD-R:        1       1       0
	Can write DVD-RAM:      0       0       0
	Can read MRW:           0               0               0
	Can write MRW:          0               0               0

  With this patch applied, instead I see:

	$ cat /proc/sys/dev/cdrom/info:
	drive name:             sr1     sr0     hdd
	...
	Can write CD-R:         1       0       0
	Can write CD-RW:        1       0       0
	Can read DVD:           0       0       0
	Can write DVD-R:        0       0       0
	Can write DVD-RAM:      0       0       0
	Can read MRW:           0       0       0
	Can write MRW:          0       0       0

  The sr1 device in particular is an ordinary CD-RW that in fact cannot
  write DVD-R.

  While messing with this code, I also thought to tweak the /proc
  formatting to align the tabbed columns.