[t13] Re: Removable Media Status Notification feature set
p.lavarre at ieee.org
Fri Apr 2 12:26:12 PST 2004
This message is from the T13 list server.
> Removable Media Status Notification feature
> set of ATA.
Here I suppose we mean the ATA ops x EF 95, x EF 31, and xDA.
I remember WHQL sometimes required the device to support those ops, but
last I checked the relevant WHQL test erroneously required op xA0 03
Packet/ Request Sense to leave the x3F6 & x01 ERR bit unchanged, ouch,
e.g. even in the presence of a UDMA CRC failure.
> I believe that this function is overlapped to SBC/MMC command set
Yes redundant with PDT x05 MMC op x4A
Massively distributed as legacy for PDT x 0E/ 07/ 04/ 00 RBC/ SBC ...
I mis/remember mostly I studied this in the Win 95 B ATAPI that
couldn't copy odd lengths of bytes per cdb. Rumour, be it truth or
slander, says Win XP/ 2K didn't bother with these ATA ops.
Are you saying someone is trying to revive them? Please no?
> and is incomplete to use in product.
Incomplete as you describe below, yes.
> So in MMC/Fuji discussion we were
> concluded that Packet device and its host software does not use this
> feature set in ATA.
> MMC has embedded changer model. SBC/MMC have many different write
> or similar media and device combination status. Removable Media Status
> Notification feature set of ATA cannot cover these items.
> ATA layer persistent prevent, C/DVD class layer persistent prevent and
> application layer prevent may conflict each other.
> I think if T13 group needs to keep this feature in ATA, someone must
> explain this feature in MMC WG.
Accurate doc would be nice, sure.
The design element I maybe most enjoyed was having the host conclude
that an SBC op x2B Seek was an MMC op x2B Seek Immediate which
completed not when x3F6 Status & x40 DRDY rose but instead prematurely
when op xDA set x3F6 Status & x01 ERR rose because the disk was
> And T13 group may need to add some
> descriptions to keep compatibility with SBC/MMC command set.
Can you say more about what you have in mind?
> I'm waiting for any commnet.
Hope this helps.
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