Mass storage... Do you want an actual mass storage device? Or are you looking for a device that simply looks like one? What I'm trying to say is, that there may be another possibility or two if you're not committed to USB. I've found USB to be very taxing to work with. It's doable, but IMHO go with another option first. On that subject, there's a pretty nifty article written in January's edition of Circuit Cellar. It's a 5-chip design (3 of which are a large 16-bit SRAM and required latches) that is an ATA-3 hard disk controller and TCP/IP enabled device (I think ftp firmware is available) Admittedly, it's not USB, and it doesn't use a PIC, but it still might fit your bill. Have a look:http://www.circuitcellar.com/library/print/0103/Eady150/index.htm I think it's worth the read. --Brendan >>>From: Ned Konz >>>Reply-To: pic microcontroller discussion list >>>To: PICLIST@MITVMA.MIT.EDU >>>Subject: Re: USB Chip Sets >>>Date: Wed, 12 Mar 2003 07:04:59 -0800 >>> >>>On Wednesday 12 March 2003 01:17 am, Alan B. Pearce wrote: >>> > >The FTDI chips look like a serial device, >>> > >not like a mass storage device. >>> > >>> > Sure the default if you have no eeprom is serial port. >>> > >>> > While the hardware interface of the "local" side of the chip is >>> > serial, I believe that putting the appropriate information into the >>> > eeprom that you can attach to the FT232 will cause the USB side to >>> > enumerate to the operating system as anything you want. >>> >>>You can change the ID numbers and description string, but that isn't >>>going to change the actual operation of the device. >>>mailto:piclist-unsubscribe-request@mitvma.mit.edu > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu