Why does my Super Drive not read some music CDs that my wifes never fails to???
The question is in the title!
Thank You
Mac mini, OS X Mountain Lion (10.8.2)
The question is in the title!
Thank You
Mac mini, OS X Mountain Lion (10.8.2)
Not all optical drives are created equal. Commercial CDs are mechanically stamped creating microscopic pits in the surface of the media that change the reflective characteristics of the surface and the resulting reflection and no reflection of the read laser that is interpreted as a binary digital signal that is interpreted as sound. Generally very few drives have a problem reading these mechanically stamped discs. Burned CDs on the other hand are coated with a dye material that changes its reflective qualities when it is "burned" by a write laser, which is stronger and a different frequency than the read laser. How well a given optical drive can read one of these burned lasers is a function of many things including:
At one time it was estimated that more than 20% of burned optical discs could be read in any given drive. This has improved over time but it is still true that not all discs can successfully be read in all drives. It is also true that optical drives are notoriously short lived. It is also relatively common that one function, say reading DVD-RW drives whille others such as CD-Rs will still work.
About the only thing you can change that effects what discs a given drive will read (or write) for that matter is dust and other detritous in the drive. Almost any office supply store will sell you a CD/DVD drive cleaning disc. They are not the easiest thing to use in slot loading drives but it can be done and may improve the number of discs your drive may read.
If the discs you are having problems reading are the mechanically stamped commercial discs, you need a new optical drive. If your mini is under warranty or AppleCare take it to the Genius Desk.
Not all optical drives are created equal. Commercial CDs are mechanically stamped creating microscopic pits in the surface of the media that change the reflective characteristics of the surface and the resulting reflection and no reflection of the read laser that is interpreted as a binary digital signal that is interpreted as sound. Generally very few drives have a problem reading these mechanically stamped discs. Burned CDs on the other hand are coated with a dye material that changes its reflective qualities when it is "burned" by a write laser, which is stronger and a different frequency than the read laser. How well a given optical drive can read one of these burned lasers is a function of many things including:
At one time it was estimated that more than 20% of burned optical discs could be read in any given drive. This has improved over time but it is still true that not all discs can successfully be read in all drives. It is also true that optical drives are notoriously short lived. It is also relatively common that one function, say reading DVD-RW drives whille others such as CD-Rs will still work.
About the only thing you can change that effects what discs a given drive will read (or write) for that matter is dust and other detritous in the drive. Almost any office supply store will sell you a CD/DVD drive cleaning disc. They are not the easiest thing to use in slot loading drives but it can be done and may improve the number of discs your drive may read.
If the discs you are having problems reading are the mechanically stamped commercial discs, you need a new optical drive. If your mini is under warranty or AppleCare take it to the Genius Desk.
Ye Gods!
Joe, either you got a lot going on in your head, are really hooked on being helpful or need a holiday ;-)
Seriously folks - Thank you very much for a complete, concise and erudite answer to my poor question. Brilliant!
Unless it was copied and pasted - hee hee!
A seriously successful answer; well written and a joy to read.
Such a shame most silly questions are not treated with the same care as you obviously have here.
Congratulations and again "Many Thanks"
Regards
Sharkey
Why does my Super Drive not read some music CDs that my wifes never fails to???