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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