Hi all! I have the following adapter: http://www.startech.com/HDD/Adapters/USB-3-SATA-adapter-cable-with-UASP~USB3S2SAT3CB which I am using it for: http://ark.intel.com/products/56604/Intel-SSD-X25-M-Series-80GB-2_5in-SATA-3Gbs-50nm-MLC and I can see in `lsusb`: Bus 002 Device 004: ID 174c:55aa ASMedia Technology Inc. ASM1051 SATA 3Gb/s bridge When using the uas driver, I can see in fdisk: Disk /dev/sdb: 74.5 GiB, 80026361856 bytes, 156301488 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 33553920 bytes But if I disable uas support in the kernel so that it fallback to usb-storage, or if I connect it to sata directly, I can see: Disk /dev/sdb: 74.5 GiB, 80026361856 bytes, 156301488 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes As you can see, there's a change in optimal i/o size. So my question is, is this "33553920 bytes" some spec/requirement of USB Attached SCSI? or could it be some kind of bug in the driver? Another question is, is it possible to disable uas (which is compiled as a module) without recompiling the kernel? If I blacklist uas, the device doesn't pop up in lsusb or lsblk; if I delete the module, it pop up in lsusb -t with empty "Driver=" but not lsblk. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
