hello, I had the same issue with 2 different pogoplug v4 with either openwrt or debian, and after reading this post i checked the power supply, i was using 5v while it should have been 12v, once changed usb and sata device appeared. thanks again, your work is gold [ 12.773706] scsi 0:0:0:0: Direct-Access ATA KINGSTON SV300S3 603A PQ: 0 ANSI: 5 [ 12.828229] sd 0:0:0:0: 23444by netrunner - Debian