Date: Tue, 19 Feb 2008 17:34:09 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: xcllnt@mac.com Cc: freebsd-usb@freebsd.org Subject: Re: Copying to usb flash drive corrupts files Message-ID: <20080219.173409.-1350499026.imp@bsdimp.com> In-Reply-To: <90085DD7-B0D6-4F95-ACAA-664B04FC2E37@mac.com> References: <32f529bc0802191400h29073d50xd23478a3389a4557@mail.gmail.com> <32f529bc0802191512t355c4d81wefdf08fda6bb0ad9@mail.gmail.com> <90085DD7-B0D6-4F95-ACAA-664B04FC2E37@mac.com>
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In message: <90085DD7-B0D6-4F95-ACAA-664B04FC2E37@mac.com>
Marcel Moolenaar <xcllnt@mac.com> writes:
:
: On Feb 19, 2008, at 3:12 PM, Łukasz Sromek wrote:
:
: > So I thought, maybe just reading is broken somehow. I've booted
: > freebsd again, mounted usb stick and copied some files. But when I
: > tried to read them under windows I got errors.
:
: We've ran into a bad USB-NAND flash controller revision
: here at work that resulted in lost writes. The problem
: was that a SYNCHRONIZE_CACHE command would stall the USB
: device, which we then cleared correctly, but a prior
: write would not hit the NAND flash.
:
: An USB analyzer would give us the information we need...
I have a MP3 player that says it is 2GB, but really is only 128MB.
any data placed beyond 128MB gives instantly corrupted results...
Warner
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