On Monday 28 December 2009 17:41:26 Pieter de Goeje wrote: > On Monday 28 December 2009 13:30:22 Alexander Motin wrote: > > Miroslav Lachman wrote: > > > 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. > > > > Thanks for the link, but all I see there is "but at this point there’s > > no such tool". IMHO it doesn't meet it is not reported. > > > > We just need somebody with that drive to run on it `camcontrol identify` > > from the fresh system and report what he sees. > > I've just ordered one of these disks. I expect it to arrive in a couple of > days. Will let you know what it says when I have it :) Ok, as Miroslav wrote, it does not report 4k sectors: # camcontrol identify ada0 pass0: <WDC WD10EARS-00Y5B1 80.00A80> ATA-8 SATA 2.x device pass0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes) protocol ATA/ATAPI-8 SATA 2.x device model WDC WD10EARS-00Y5B1 firmware revision 80.00A80 serial number WD-WCAV55072095 WWN 50014ee2ae6664fd cylinders 16383 heads 16 sectors/track 63 sector size logical 512, physical 512, offset 0 LBA supported 268435455 sectors LBA48 supported 1953525168 sectors PIO supported PIO4 DMA supported WDMA2 UDMA6 overlap not supported Feature Support Enable Value Vendor read ahead yes yes write cache yes yes flush cache yes yes Native Command Queuing (NCQ) yes 31/0x1F Tagged Command Queuing (TCQ) no no 31/0x1F SMART yes yes microcode download yes yes security yes no power management yes yes advanced power management no no 0/0x00 automatic acoustic management yes no 254/0xFE 128/0x80 media status notification no no power-up in Standby yes no write-read-verify no no 0/0x0 unload no no free-fall no no According to the anandtech article, this is because Windows XP does not work with sectorsize != 512 bytes. - PieterReceived on Thu Dec 31 2009 - 15:13:37 UTC
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