mmcformat(8) - NetBSD Manual Pages

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MMCFORMAT(8)            NetBSD System Manager's Manual            MMCFORMAT(8)

mmcformat -- format optical media
mmcformat [-BDFGHhIMOpRrSsw] [-b blockingnr] [-c cert-num] special
The mmcformat utility formats optical media conforming to the MMC stan- dard. This includes CD, DVD, and Blu-Ray (BD) media. The options are as follows: -B Blank media when possible before formatting it. -b blockingnr Explicitly select packet size in sectors (for CD-RW only). It is not recommended to change this from its default of 32. -c cert-num Certify media for DVD-RAM / DV-RE. The argument cert- num specifies: 0 no certification 1 full certification 2 quick certification -D Debug mode. Print all SCSI/ATAPI command errors. -F Format media. -G Grow last CD-RW/DVD-RW session. -H Show help and print formatting choices for the inserted media. -h Show help and print formatting choices for the inserted media. -I Show help and print formatting choices for the inserted media. -M Select MRW (Mount Rainier) error correcting background format. -O Old style CD-RW formatting; recommended for CD-RW. -p Explicitly set packet format. -R Restart previously stopped MCD-MRW or DVD+RW background format. -r Recompile defect list for DVD-RAM. -S Grow spare space DVD-RAM / BD-RE. -s Format DVD+MRW / BD-RE with extra spare space. -w Wait until completion of background format.
Due to the enormous varieties in optical media, mmcformat is made as generic as possible. This can result in confusion.
mmcformat -B -O /dev/rcd0d Blanks and then formats a CD-RW disc using the ``old style'' format com- mand. It is recommended to use this ``old style'' command unless your drive reports that it's not supported; in that case, resort to the default -F. Note that a CD-RW disc can be reformatted without being blanked. Blanking switches between sequential and fixed packet writing by erasing the disc. This can also help to revive old discs. mmcformat -F -M /dev/rcd0d Format a CD-RW or a DVD+RW to use MRW (Mount Rainier). This format tries to hide media flaws as much as possible by relocation.
The mmcformat command first appeared in NetBSD 5.0.
Reinoud Zandijk <>
mmcformat could be merged with scsictl(8) but that tool is very hard disk oriented. NetBSD 9.3 May 9, 2008 NetBSD 9.3
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