site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Importance: Normal User-agent: SquirrelMail/1.4.5 Alex (et al), Thanks for the reply. What I am working on is adding "EAC-like" functionality (secure cd ripping) to my application (http://sbooth.org/Max/). In order to perform true error correction and verify that the audio data is correct, I need to compare multiple reads of the same sector. Obviously if erroneous data is in the cache then multiple reads of the same sector will always produce the same result. Hence the need to either 1) disable the cache or 2) read a block larger than the cache (2048 on my drive, too large for practical purposes) or 3) read a sector, flush the cache, re-read the sector, etc. So I am not writing a device driver per se, just performing some low-level manipulation. Stephen

I am not sure on which level you are looking.

My time in CD-Recording is over for four years now - which is an eternity in IT. That said, I am sure the MMC3 command set has commands to do all these things.

However, why would you need to do this? If you are writing to the device yourself, then you probably came across MMC command sets.

Forcing the cache to be flushed when other applications are writing to the device is usually not a good idea.

Alex

Am 13.01.2006 um 16:05 schrieb me@sbooth.org:

...

Hello all,

I had inquired about this a while back and never got a response, so thought I'd ask again.

Is there a way to control the hardware cache on cdrom drives in OS X? For example, I would like to turn caching on/off, force a flush of the cache, etc. It seems there should be an ioctl() to do this. But, all my searching has turned up nothing. What have I missed? _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/below%40mac.com

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