25.01.2011 07:23, Mark Lord wrote: > On 11-01-24 10:52 PM, Martin K. Petersen wrote: > .. >> If the drive had reported its block size correctly mkfs would have >> picked this information up automatically. > > Apparently revision 00Z drives now show 4096 physical sector size, > with 512 for logical. Can anyone out there confirm this first-hand? > (hdparm -I) There's no "00Z" revision for 20EARS, as far as I can tell. There is, however, 00Z revision for 15EARS, which is 1.5Tb. I've this drive: Model Family: Western Digital Caviar Green (Adv. Format) family Device Model: WDC WD20EARS-00MVWB0 Serial Number: WD-WMAZ20464440 Firmware Version: 50.0AB50 this was the latest (the 3-platter version) of the drive as were available ~2 months ago. This drive does NOT report 4kb, it tells that both logical and physical sector size is 512 bytes. But it actually uses 4kb sectors internally, which is visible when writing by chunks of <4Kb with O_DIRECT: any size which is not multiple of 4Kb and performance drops for a factor of 3..4. Reportedly, WD15EARS with 00Z firmware does report all the parameters correctly. I've no idea what about WD10EARS, more recentl 2TB+ drives and why they don't have (or do they?) "right" firmware for 20EARS... Thanks! /mjt -- 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
