CheckSense : checks the sense error code.

ExecIoctl :.

GetDeviceSerial returns unit serial number of the device using vpd page 0x80.

GetErrString get the error string.

GetNOSVersion :.

IsGroupScopedTarget :.

TestUnitReady to know if device is connected.

StandardInquiry :.

Vpd80Inquiry :.

Hdr is our version of sg_io_hdr_t that gets passed to the sg_io ioctl.