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On Wed, May 17, 2006 at 11:30:55AM +0300, Jan Wagner wrote: > Maybe yes, that, or hdparm, but it seems like a horrible hack :) And sg > being for generic SCSI, I'm not sure how well ATA-7 fits in. At least, > the current debian sg-tools, and commands like 'sg_opcodes /dev/sda' > return "Fixed format, current; Sense key: Illegal Request", "Additional > sense: Invalid command operation code" for those SATA disks I tried. > Doesn't look good for sg useability, AFAICT. Just because sgtools doesn't work with it doesn't mean there aren't commands you can send through sg to work with it. > To record or play back real-time continuous streamed data that is not > error-critical but delay critical, from/to a bidirectional data > aquisition card at ~1Gbit/s over longer time spans. Do you know of a disk that can handle 1Gbit/s to the platter? Or are you planning to stripe this across multiple disks? I would think a controller on a fast enough bus (plain PCI isn't going to handle it), with enough drives in a raid setup of the right type should probably handle it. Might need to do a filesystem specially designed for the streaming needs rather than general purpose file storage. > Direct kernel device support for the feature set could also be very useful > for linux projects like the Digital Video Recorder and Video Disk > Recorder. And seek/stutter free video playback from DVD/ATAPI (scratched > disks, for example) or video editing. Etc. Can you tell a DVD drive to stop retrying? Perhaps you can. I know some of the retries are in software. Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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