Actually Windows won't allow you to create more than one partition on a USB device only if it has the "removable disk" flag set. Some USB mass storage devices don't have this flag set (from the factory), and if it's not set you can partition it normally.
It is also possible to flash many makes and models of USB flash drives with the flash chip manufacturer's tools (which are often easy to find online). Sent from my iPhone > On Sep 21, 2015, at 8:45 AM, Nick Holland <n...@holland-consulting.net> wrote: > >> On 09/21/15 08:54, Mohammad BadieZadegan wrote: >> OK, It's true, >> But spliting the memstick into 2 partition causes more questions: >> 1.What tools can do that best? > > sadly, Windows is kinda stupid about this. It sees a USB device and > wants to use the whole thing, it won't let you subpartition the device > (ok, haven't tested this extensively on 7+). > > So...you will need to create your partitions with OpenBSD. Boot off a > bsd.rd, install, and at the fdisk step, choose "edit", create your > Windows and OpenBSD partition, finish the OpenBSD install. > > THE WINDOWS PARTITION MUST BE FIRST, both numerically and on the disk. > Windows treats USB (and other removable?) storage differently than > SATA/IDE/SCSI/SAS storage. > >> 2.What is the size of partitions? > > "as big as you need". What do you want to do? > 1G is an easy to do install. 512M is kinda snug. 256M is possible > (baseXX.tgz and kernel only!), but difficult, I recently found out. 2+G > gives more room for apps and data. > >> 3.How can write OpenBSD memstick image on the last partition? > > regular install! > > Quite a few years ago, I helped an electronic artist make some "talking > donation sculptures" -- stick money in the thing, and it would "reward" > you with a witty response. We used 1G CF cards on some small desktop > machines. Iirc, I partitioned them about 50/50 FAT and OpenBSD. The > sound files were stored on the FAT partition, so Joe Average Computer > User could add/remove/change the sound files simply by yanking the card > out of the computer and putting it a USB reader, changing what they > wished to change, and put it back, reboot and done (and probably wonder > where the rest of the programs were :) > > I've also made USB sticks which are both OpenBSD systems AND useful for > moving files around between Windows or other FFS-challenged systems. > > Nick. > >> On Mon, Sep 21, 2015 at 4:12 PM, Dmitrij D. Czarkoff <czark...@gmail.com> >> wrote: >> >>> Mohammad BadieZadegan said: >>>> How put OpenBSD image on it that don't curropt its file system or booting >>>> OpenBSD? >>> >>> The easiest way is to split your drive in two partitions: first one >>> should be FAT32 if you want it so, and the last one should be OpenBSD >>> slice. >>> >>> Windows and most consumer devices' firmwares don't read partition table >>> on USB flash devices, so these systems won't notice your OpenBSD >>> partition, but it will be bootable. >>> >>> -- >>> Dmitrij D. Czarkoff
