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When CDFS wants to change the drive's data mode to mount a DVD it does so via CD_SetParameters. As a side effect of that call, the read retry count is written too.
Some drives return illegal request errors when trying to set the read retry count (even though they're marked as changeable), so just swallow the error like CDFSSoftSCSI does (driver.c revision 1.4 line 566).
Fixes "Compact disc is faulty" error with Samsung SH-S223B drive - the error message was spurious as it's just the default the error handler assumes when it can't look up error 0x50.

Version 1.38. Tagged as 'ATAPI-1_38'