Date: Tue, 20 Apr 2004 10:58:05 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-hackers@freebsd.org Subject: Re: Detecting 'floppy' like umass devices Message-ID: <20040420085805.GA5279@cicely12.cicely.de> In-Reply-To: <200404192247.48015.doconnor@gsoft.com.au> References: <200404192247.48015.doconnor@gsoft.com.au>
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On Mon, Apr 19, 2004 at 10:47:48PM +0930, Daniel O'Connor wrote: > A friend of mine handed me a USB flash key today that has 2 'partition' - one > 1.44Mb chunk pretends to be a floppy drive and the rest is a normal umass > device. > > I am wondering if there is any way of telling if a given umass device is > a floppy drive (or wants to look like one) - eg I have a USB FDD which > I imagine should fall into the same basket. What do do you mean with "wants to look like one". In which way does a floppy look different from other direct access drives? They all read and store direct access data. > I note that you get wacky values from fdisk when you try and read partition > table from them too.. > > On another note my USB floppy drive does 2k/sec in FreeBSD :( Sound like another instance of msdosfs does no clustering and drive is too stupid to get speed without. IIRC there were some work on this point, but I don't now the state. Check the speed with dd and different blocksizes. > It's one of these -> > Apr 19 22:45:32 inchoate kernel: umass0: NEC NEC USB UF000x, rev 1.10/1.50, addr 2 > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): INQUIRY. CDB: 12 0 0 0 24 0 > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): CAM Status: SCSI Status Error > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): SCSI Status: Check Condition > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): UNIT ATTENTION asc:29,0 > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): Power on, reset, or bus device reset occurred > Apr 19 22:45:33 inchoate kernel: (probe0:umass-sim0:0:0:0): Retrying Command (per Sense Data) > Apr 19 22:45:35 inchoate kernel: da0 at umass-sim0 bus 0 target 0 lun 0 > Apr 19 22:45:35 inchoate kernel: da0: <NEC USB UF000x 1.50> Removable Direct Access SCSI-0 device > Apr 19 22:45:35 inchoate kernel: da0: 1.000MB/s transfers > Apr 19 22:45:35 inchoate kernel: da0: 1MB (2880 512 byte sectors: 64H 32S/T 1C) > Apr 19 22:45:36 inchoate kernel: umass0: Unsupported UFI command 0x35 > Apr 19 22:45:36 inchoate kernel: (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x6, scsi status == 0x0 > Apr 19 22:45:36 inchoate kernel: umass0: Unsupported UFI command 0x35 > Apr 19 22:45:36 inchoate kernel: (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x6, scsi status == 0x0 Nothing wrong with those messages. > I have a Dell Inspiron 8600 with a > uhci0: <Intel 82801DB (ICH4) USB controller USB-A> port 0xbf80-0xbf9f irq 11 at device 29.0 on pci0 > > I have tried a USB flash card reader which gets ~500k/sec. If a drive doesn't preread blocks then each access has to wait for the media - undoubly flash has a faster access time than floppies... -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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