Date: Tue, 24 May 2011 09:35:10 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Andriy Gapon <avg@freebsd.org> Cc: "Andrey V. Elsukov" <bu7cher@yandex.ru>, Warner Losh <imp@bsdimp.com>, freebsd-geom@FreeBSD.org Subject: Re: [RFC] Remove requirement of alignment to track from MBR scheme Message-ID: <D7C4124D-A690-4960-B141-594C7E2BE792@mac.com> In-Reply-To: <4DDB5375.6050004@FreeBSD.org> References: <4DDA2F0B.2040203@yandex.ru> <D75B2856-D9D8-4BA3-BC54-8258610CEA06@xcllnt.net> <9ED563AB-7B35-40F4-A33E-015317858401@bsdimp.com> <4DDB5375.6050004@FreeBSD.org>
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On May 23, 2011, at 11:43 PM, Andriy Gapon wrote: > on 23/05/2011 20:38 Warner Losh said the following: >> >> On May 23, 2011, at 10:35 AM, Marcel Moolenaar wrote: >>> I think we've had enough rushed and ill thought-out changes going >>> in already and I can see that not aligning MBR partitions on a track >>> boundary is potentially perceived as a PITA violation. > > _PITA_ violation? :-) > As to POLA - yeah, I can see people getting astonished that finally FreeBSD got > its sh*t together and did the right thing, years after all other OSes (even > Winddows) had done it. :-) Well, I just initialized a USB stick on my Mac and I see that it still adheres to some notion of geometry: : ugen3.2: <ITE Tech Inc.> at usbus3 umass0: <ITE Tech Inc. USB FLASH STORAGE, class 0/0, rev 2.00/2.00, addr 2> on usbus3 da0 at umass-sim0 bus 0 scbus0 target 0 lun 0 da0: <Simple Bonzai Xpress 2.20> Removable Direct Access SCSI-2 device da0: 1.000MB/s transfers da0: 499MB (1023484 512 byte sectors: 64H 32S/T 499C) GEOM: da0s1: EBR has non empty bootcode. GEOM: msdosfs/MAC: EBR has non empty bootcode. marcelm-server% gpart show da0 => 32 1023424 da0 MBR (499M) 32 31 - free - (15k) 63 1023372 1 fat32 (499M) 1023435 21 - free - (10k) gpart synthesized a 64 head, 32 sectors/track geometry, which is not the same as the 63 sectors/track that Mac synthesized. Yes, this demonstrates the bogosity of geometry, but it also shows that it still exists. All I'm saying: be careful. -- Marcel Moolenaar xcllnt@mac.com
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