Date: Fri, 17 Dec 2010 11:55:26 +0000 From: Alexander Best <arundel@freebsd.org> To: freebsd-scsi@freebsd.org Subject: "camcontrol identify ada0" and "diskinfo -v ada0" reporting different cylinders count Message-ID: <20101217115526.GA20772@freebsd.org>
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hi there, "diskinfo -v ada0" reports: ada0 512 # sectorsize 250058268160 # mediasize in bytes (233G) 488395055 # mediasize in sectors 0 # stripesize 0 # stripeoffset 484518 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. S09QJ1GLB35451 # Disk ident. and "camcontrol identify ada0" reports: pass1: <SAMSUNG SP2504C VT100-50> ATA-7 SATA 2.x device pass1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) protocol ATA/ATAPI-7 SATA 2.x device model SAMSUNG SP2504C firmware revision VT100-50 serial number S09QJ1GLB35451 cylinders 16383 heads 16 sectors/track 63 sector size logical 512, physical 512, offset 0 LBA supported 268435455 sectors LBA48 supported 488395055 sectors PIO supported PIO4 DMA supported WDMA2 UDMA6 Feature Support Enabled Value Vendor read ahead yes yes write cache yes yes flush cache yes yes overlap no Tagged Command Queuing (TCQ) no no Native Command Queuing (NCQ) yes 32 tags SMART yes yes microcode download yes yes security yes no power management yes yes advanced power management no no automatic acoustic management yes yes 0/0x00 254/0xFE media status notification no no power-up in Standby no no write-read-verify no no unload no no free-fall no no data set management (TRIM) no ...so how many cylinders does my hdd have? cheers. alex -- a13x
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