99 lines
3.3 KiB
Plaintext
99 lines
3.3 KiB
Plaintext
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February 25, 2002
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MacOS 10.1 driver now in the tree in libscg/scsi-mac-iokit.c.
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It supports:
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* Firewire, USB, and ATAPI MMC-3 compliant burners
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* SCSI parallel bus attached burners (requires MacOS X.1.3)
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It does not support:
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* Older non MMC-3 burners
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* CD-ROM drives/DVD-ROM drives (i.e. non-burners)
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Note that this is a limitation of MacOS X and not of the driver.
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See the end of the document if you're curious why.
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If you just want to burn ISO images, you may want to consider using Apple's
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hdiutil program, but it is not clear how standard compliant this method is.
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Building
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--------
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Note if you installed MacOS X on a HFS+ volume, make install will fail if
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there is a file called INSTALL in the directory tree because this Filesystem
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is not POSIX compliant. POSIX requires to honor character case but HFS+
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ignores the character case. If you like to use "make install" rename
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INSTALL to something else. (e.g. INSTALL.txt)
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Device Naming
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-------------
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You need to pass a device name on the command line to the cdrecord utility
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CD burners: (probably) IOCompactDiscServices
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DVD burners: (probably) IODVDServices
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# ./cdrecord dev=IOCompactDiscServices -toc
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or if you have multiple drives, you can append a number to differentiate
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# ./cdrecord dev=IOCompactDiscServices/2 -toc
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That should talk to the second CD-R on the system (NOT TESTED).
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Sharing nicely with the Finder
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------------------------------
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The MacOS 10.1 Finder will offer to burn any blank media you put into
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the burner. However, you don't want to use the Finder, you want to
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use cdrecord! So, how do you get around this problem?
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When you insert the media, the Finder asks "Do you want to prepare this
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disc?". Click on the "Ignore" button.
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The Finder will then say "No volumes found. Click Continue to continue
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without ejecting". Click on the "Continue" button.
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Common Errors
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-------------
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No matching device ... found:
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Make sure you typed the device names correctly. See above. Use ioreg
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-l to find if there is an IOCompactDiscServices or IODVDServices in
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the device tree.
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Unable to get exclusive access:
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Another programs (usually the Finder) has exclusive access to the drive.
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See "Sharing Nicely with the Finder"
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Unable to get plugin interface:
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The SCSI Architecture Family of drivers (supports Firewire, ATAPI, and
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USB) has a special module that allows user code like libscg to send
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SCSI commands to a device. This module is only attached, though, if
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the kernel device driver thinks the device is sufficiently interesting
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(e.g. the kernel thinks it's a burner).
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You can see if the module is loaded by looking for
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SCSITaskUserClientIniter in the output of ioreg -l.
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Why doesn't it support my SCSI device?
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--------------------------------------
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Apple's kernel drivers enforces the rule that application cannot send
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SCSI commands to devices for which they feel they have enough kernel
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support. This includes hard disks and CD/DVD ROMs. They make an exception
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for burners, though.
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There are two possible work-arounds, neither of which has been
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implemented. One is to write a kernel driver that wraps the Apple
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kernel drivers and exposes a raw SCSI interface, overriding the Apple
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kernel drivers. The other is to write a SCSI device emulator at user
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mode that translates SCSI commands into the appropriate interface
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calls to IOKit.
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Bugs
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----
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Send bugs to: csapuntz@stanford.edu
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