Hello,

I would like to clarify the request for condition clarification of the “Media Eject request”.

The current MMC and Mt Fuji document leave room to interpretation as to when will devices report this user request. The texts are:

Mt Fuji 7r08:

“1h EjectRequest

The logical unit has received a request from the user (usually through a mechanical switch on

the logical unit) to eject the specified slot or media.”

“Note: Usually two Events are generated when the user requests an eject: first, an EjectRequest Event, and then a

MediaRemoval Event.”

This suggests that actually the event is reported regardless of the persistent & prevent bit (which makes it possible that the two events are generated one after another without the need for the host to pick up the request event and execute/allow the actual eject).

MMC 5r04:

“1h EjectRequest The Drive has received a request from the user (usually through a

mechanical switch on the Drive) to eject the specified slot or media.”

There is no note in MMC.

Reported implementation interpretations [thanks to Katata-san]:

Type 1. When Persistent=1 and Prevent=1, drive reports EjectRequest on Media

Class Event.

Type 2. When Prevent=1, drive reports EjectRequest on Media Class Event.

Microsoft’s request is to clarify the specification so there is no longer room for interpretation.

Microsoft’s requirements as part of the clarification:

Bare minimum is that the device SHALL report user’s eject request when the tray is lock.

That the device further reports user’s eject request when the tray is not locked is nice to have, but not mandatory. However, IF devices report user’s eject request when the tray is not locked, then this behavior SHALL be consistent across devices. If devices do NOT report user’s eject request when the tray is not locked, then this behavior SHALL be consistent across devices.

Software must be able to distinguish between device which behavior is open to interpretation (that is, all current drives) and drives that are design after this specification clarification. This likely can be solved by increasing the revision of Removable Medium feature.

Microsoft’s proposal as clarification:

Removable Medium feature version is increased from 0000b to 0001b.

Add note: “Logical unit shall report all eject requests from the user regardless of the locked or unlocked state of the tray.”

We are open to other proposals.

Best regards,

David Burg.