On Wed, Feb 25, 2009 at 09:50:43PM -0500, Theodore Tso wrote: > On Wed, Feb 25, 2009 at 06:27:18PM -0500, Martin K. Petersen wrote: > > Because of 63-sector legacy problems a bunch of ATA vendors will > > initially ship 512/4096 drives that are not naturally aligned. > > I.e. logical sector 63 will be aligned on a 4KB hardware sector > > boundary to overcome the misaligned default partitioning. > > Are we *sure* that this is what they plan to be doing? Is there a way > we can query the hardware to find out for sure what drives are doing > what? The drive I have that's pretending to be a 512/4k drive reports this: $ sudo sg_readcap -l /dev/sdc Read Capacity results: Protection: prot_en=0, p_type=0 Last logical block address=625142447 (0x2542eaaf), Number of logical blocks=625142448 Logical block length=512 bytes Logical blocks per physical block=3 (log base 2) [actual=8] Lowest aligned logical block address=0 Hence: Device size: 320072933376 bytes, 305245.3 MiB, 320.07 GB This disagrees with Martin's assertion. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
