[rescue] CD problems

Sandwich Maker adh at an.bradford.ma.us
Tue May 19 21:27:41 CDT 2020

" From: John-Paul Stewart <jpstewart at sympatico.ca>
" On 2020-05-19 5:51 p.m., Carl R. Friend wrote:
" > On 5/19/20 5:39 PM, silvercreekvalley wrote:
" >>
" >> Now I know the CDROM and media is OK as it works on the Ultra 10.
" > 
" >    Does the drive support 512 bytes/sector transfers?   I seem to
" > recall that a lot of the earlier Sun kit required that.
" More specifically, are the drive jumpers set for 512 bytes/sector?
" Earlier machines usually require that jumper, while later ones (such as
" the Ultra 10) don't.  (Due to differences in firmware, I believe.)

all pre-ultras require the jumper.  it was only late in that era
that the cdrom command set was enhanced to include a blocksize mode
select, so obp2 and earlier don't have it.  by the time ultras and
obp3 - and dvds - came around the enhancements were omnipresent.

if it's a sun drive it should already be jumpered.

" From: Patrick Giagnocavo <patrick at zill.net>
" I dimly recall that it mattered (not sure why) at what SPEED I wrote the CD-R media.
" I would write at max speed, it completed with no errors, but would not work.
" Try writing your media at 1X or 2X speed, and see what happens.

i've heard that too.  older drives seem to need a good hot burn - less
sensitive i suppose.
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh at an.bradford.ma.us                       and think what none thought

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