Alexander Motin wrote: > Thomas Backman wrote: >> On Dec 25, 2009, at 11:58 AM, Alexander Motin wrote: > |>> Recently WD released first series of ATA disks with increased physical >>> sector size. It makes writes not matching with 4K blocks inefficient >>> there. >> They don't expose this to the OS, though (not by default, anyway), but chop it up into 8 512-byte sectors for compatibility reasons. >> Just thought I'd point that out - I'm not even sure if you can get them to *not* do the compatibility thing and expose 4k-sized sectors. > > Latest ATA-8 specification allows drive to report both logical (512B) > and physical (4KB) sector sizes. ada driver able to fetch and report > that info to GEOM. If these drives not reporting it yet (are you really > sure?), it is only question of their firmware. There is an article about 4k sectors http://www.anandtech.com/storage/showdoc.aspx?i=3691 It is completely hidden to OS in first versions. Miroslav LachmanReceived on Mon Dec 28 2009 - 10:58:29 UTC
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