site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com On Sep 11, 2008, at 12:46 PM, Brian Bergstrand wrote: Hi Chris, thanks for the reply. My comments follow inline. On Sep 10, 2008, at 8:00 PM, Chris Sarcone wrote: Brian -- Under section 6.54.1.6 "Error outputs" Apple's SMART sample code does not do this: http://developer.apple.com/samplecode/SMARTQuery/listing3.html Brian Bergstrand <http://www.bergstrand.org/brian/> PGP Key ID: 0xB6C7B6A2 _______________________________________________ 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/site_archiver%40lists.appl... I filed a bug (rdar:// 6184934) about this exact same error being returned from an SATA SMART service provider. I can reliably reproduce the bug on both my 2006 iMac and 2007 MBP, but the bug was closed by Apple as not reproducible because I don't have a SATA sniffer to get SATA dump. This sample code is incorrect. I suggest you review the ATA-7 Command Set reference. "If the device does not support this command, if SMART is not enabled, or if the values in the Features, LBA Mid, or LBA High registers are invalid, the device shall return command aborted." Have you validated via the IDENTIFY DEVICE data that SMART is enabled? Your sample code does not enable SMART operations before asking for SMART status...Apple's code does. All it does is query the IDENTIFY data to see if SMART is supported and that is not necessary with 10.4.9 or later because IOKit publishes the property key "kIOPropertySMARTCapableKey" in device objects who are SMART capable; this latter method is used by the bug sample code. Sorry, spoke too quickly, the sample code does enable SMART. It does so blindly and then turns SMART off when its done because of "performance" problems. However, the ATA spec specifically says that SMART shall not impact drive performance except while an off-line test is running. This email sent to site_archiver@lists.apple.com