Date: Mon, 14 Aug 2006 12:44:11 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: marc.vanwoerkom@FernUni-Hagen.de Cc: freebsd-usb@freebsd.org Subject: Re: SD card speed Message-ID: <20060814.124411.1649765968.imp@bsdimp.com> In-Reply-To: <44E053CE.4090304@fernuni-hagen.de> References: <44E00CFE.5090806@fernuni-hagen.de> <courier.44E01EDB.00000942@intron.ac> <44E053CE.4090304@fernuni-hagen.de>
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In message: <44E053CE.4090304@fernuni-hagen.de>
Marc van Woerkom <marc.vanwoerkom@FernUni-Hagen.de> writes:
: What the heck is the difference between
: a formatting done with sysinstall's fdisk
: and Windows XP's format?
Chances are that there's a 'mbr signature recognition' that looks for
certain kinds of FAT file systems so that the part can implement an
improved 'wear averaging' algorithm that knows which sectors are
unused giving it a much larger pool to rotate wear through, especially
in low allocation situations. How to make FreeBSD's fdisk do the
right thing is an interesting question...
There are some CF parts that are 4x slower at write when you format
them for ffs than when you format them for FAT.
Warner
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