Hugh Dickins wrote:
On Wed, 6 Aug 2008, Martin K. Petersen wrote:
"Hugh" == Hugh Dickins <hugh@xxxxxxxxxxx> writes:
Hugh> Commit e0597d70012c82e16ee152270a55d89d8bf66693 (sd: Identify
Hugh> DIF protection type and application tag ownership) says that if
Hugh> a disk is formatted with Inquiry bit PROTECT=1, it is required
Hugh> to support Read Capacity(16). But my SD cards, accessed by
Hugh> builtin cardreader and generic USB storage, disagree.
Argh. That's really broken. USB storage has no business setting
PROTECT.
Can you send me the sg_inq output so I can see what else they are
returning?
sg_inq? I assume that's the same as the inquiry_len bytes at inquiry:
00000000: 00 8d 00 01 1f 01 00 00 47 65 6e 65 72 69 63 2d ........Generic-
00000010: 4d 75 6c 74 69 2d 43 61 72 64 20 20 20 20 20 20 Multi-Card
00000020: 31 2e 30 30 1.00
Ah, sg_inq is a command which spells that out, here you go:
standard INQUIRY:
PQual=0 Device_type=0 RMB=1 version=0x00 [no conformance claimed]
[AERC=0] [TrmTsk=0] NormACA=0 HiSUP=0 Resp_data_format=1
SCCS=0 ACC=0 TGPS=0 3PC=0 Protect=1 BQue=0
EncServ=0 MultiP=0 [MChngr=0] [ACKREQQ=0] Addr16=0
[RelAdr=0] WBus16=0 Sync=0 Linked=0 [TranDis=0] CmdQue=0
length=36 (0x24) Peripheral device type: disk
Vendor identification: Generic-
Product identification: Multi-Card
Product revision level: 1.00
Classic, USB strikes again! One needs to go back to SCSI-1
(1985 ?) to find when byte 5 bit 0 of an INQUIRY response
could be used for anything other than PROTECT.
So that bit is reserved in SCSI-2, SPC and SPC-2 then
has its current meaning in SPC-3 and SPC-4.
Doug Gilbert
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