hi all i have the sata-usb adapter . so my raspberry pi 3 runs openbsd snapshots only with sata-usb adapter and ssd only . namely it needs no ssd card . and the size of adapter is about 5x4x1cm .
------------ about adapter ssd$ dmesg | grep USB usb0 at dwctwo0: USB revision 2.0 umass0 at uhub1 port 2 configuration 1 interface 0 "Generic USB Mass Storage Device" rev 2.00/2.20 addr 4 ssd$ dmesg | grep umass umass0 at uhub1 port 2 configuration 1 interface 0 "Generic USB Mass Storage Device" rev 2.00/2.20 addr 4 umass0: using SCSI over Bulk-Only scsibus0 at umass0: 2 targets, initiator 0 ----------- it is strange at first df shows only 5GB space . so i try growfs . more supprisingly growfs runs well on arm . so my now space is --- df Filesystem 512-blocks Used Avail Capacity Mounted on /dev/sd0a 57133400 806600 53470132 1% / --- about 28GB ! the method of growfs is on https://qiita.com/tyokai/items/ead7a5b4b176cd3ef5a0 --- regards