From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <51253FBD.9090605@yahoo.fr> Date: Wed, 20 Feb 2013 22:27:25 +0100 From: Nicolas Bercher User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.24) Gecko/20111120 Icedove/3.1.16 MIME-Version: 1.0 To: 9fans@9fans.net References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [9fans] [RQ:] SATA HD 2+ TB native recommendations Topicbox-Message-UUID: 1b39a32c-ead8-11e9-9d60-3106f5b1d025 On 20/02/2013 15:04, erik quanstrom wrote: > 4k drives only work in 9atom. and they're not recommended > as a boot drive. Do you mean 4k drives that reports 4k block size or 4k drives that report 512B? > i've found it hard to tell, even reading the data sheets if a drive > is 512 or 4k. but many drives have the lba number on the sticker. and > for example 3907029168 corresponds to 512-byte sectors, 2T. > > 3907029168*512/1000^4 = 2.0 > > - erik My WD hdd hosts a "Plan 9 from Bell Labs" from Bell Labs, it is a WDC WD15EARS-00Z. I'm 99% sure* it is a 4k hdd that reports 512B block sizes. And when I installed the system, I did all the partitioning by hand to ensure alignment for every Plan 9 partition. It was quite a pain. I didn't take a look seriously to the sticker, I will next time the box will be opened. Nicolas -- * If I remember well, I did some tests with misaligned partitions under Linux, R/W operations were so slow...! To me, it's hard to be sure whether it's a 512B or 4kB hdd without performing some tests, like this.