SSC/SMC wg minutes, Nov 14, 1995, X3T10/95-326r0

Erich Oetting erich_oetting at
Sat Sep 16 08:38:33 PDT 1995

Minutes of SSC/SMC Working Group mtg.                   X3T10/95-326 r0
Bedford, NH.

Accredited Standards Committee X3, Information Technology

To:         Membership of X3T10

From:       Erich Oetting

Subject:    Minutes of SSC/SMC Working Group Meeting
            Bedford, NH.  September 14, 1995


1. Opening Remarks

2. Approval of Agenda

3. Attendance and Membership

4. SSC Topics
4.1 - Density Support command. (X3T10/95-224r4)
4.2 - Supported compression algorithms.
4.3 - Log Sense parameters. (X3T10/95 - 304r0)
4.4 - Prevent/Allow Media Removal.
4.5 - Initiator controlled write protect.  (X3T10/95-134r0)
4.6 - Write once tape devices.
4.7 - World wide ID on tape media.

5. SMC Topics.
5.1 - Attached Medium Changer.

6.   Other Topics
7.   Meeting Schedule.
8.   Adjournment.

                          Results of Meeting

1.    Opening Remarks

Ted Lappin, the SSC Technical Editor, called the meeting to order at 9:05
a.m., Thursday, September 14, 1995.  He thanked Charles Monia of DEC for
arranging and hosting the meeting.

As is customary, the people attending introduced themselves and a copy of
the attendance list was circulated.

The draft agenda was approved.

3.    Attendance and Membership

Attendance at working group meetings does not count toward minimum
attendance requirements for X3T10 membership.  Working group meetings
are open to any person or organization directly and materially affected by
X3T10's scope of work.

The following people attended the meeting:

         Name            S   Organization         Email Address
----------------------   --  ---------------     ---------------
Mr. Erich Oetting        P   Storage Technology  erich_oetting at
Mr. Bill Dallas          A   DEC                 dallas at
Mr. Arlan Stone          A   Unisys              arlan.stone at
Mr. Paul Entzel          O   Conner              paul.entzel at
Mr. Edward Lappin        P   Exabyte Corp.       tedl at
Mr. Ralph Weber          A   ENDL Associates     roweber at
Mr. Roger Cummings       A   Storage Technology  roger_cummings at

7 People Present

Status Key:  P    -  Principal
             A    -  Alternate
             O    -  Observer
             L    -  Liaison
             V    -  Visitor

4.   SSC Topics

4.1 - Density Support command (X3T10/95-224r4)

Ted went over his Report Density Support command proposal.  If this is
approved by the Plenary Ted will integrate it into SSC and move the
current density code table to an informative annex.

A discussion on how to handle the default density code of 00h was held.
Ted will add a note saying when  the drive default density code depends on
the media installed, multiple codes may return the Deflt bit set when the
media bit is zero.  Only one density code should have the Deflt bit set
when the media bit in one.

4.2 - Data Compression Page.

Bill Dallas pointed out that there is no current way to determine what
compression algorithms are available.  The possibility of adding this
information to the Density Support command by using Page Codes was
discussed.  A further possibility is to create a more general command that
could be used in any command set.

4.3 - Log Sense parameters. (X3T10/95 - 304r0)

The proposal from Arlan Stone to add a Log Sense parameters for cleaning
and compression ratio information to SSC was discussed. The working group
recommended this document be approved by the plenary after making some
minor wording changes.

4.4 - Prevent/Allow Media removal command.

Ted pointed out that the Prevent/Allow Media Removal command should be in
the SPC document as it can be used by tape, disk and CD rom devices.  The
working group recommended that it be moved to SPC.

Should an Unload command should be allowed when the prevent condition
exists? The current Prevent/Allow Media Removal command wording is unclear
on this point.

4.5 -  Initiator controlled write protect. (X3T10/95-134r0)

Arlan proposed that the Software Write Protect bit be moved from the
read-write error recovery mode page to the device configuration mode
page.  Ted suggested bit 2 of byte 10 for this use.  The working group
recommended that this be approved by the Plenary.

4.6 - Write once tape devices.

A short discussion on how to handle a tape device that only allows writing
at end of data was held.

4.7 - World wide ID on tape media.

How to report a media serial number or world wide ID was discussed, but no
decision was reached.

5.    SMC Topics.

5.1 - Attached Medium Changer.

SMC revision 4 does not have the correct command codes for the Attached
Medium Changer model approved in document X3T10/95-103R2.  Read Element
Status should be B4h and Move Medium should be A7h.  This will be
corrected in the next revision.

6.   Other Topics

No other topics were discussed.

7.    Meeting Schedule

The next meeting of the SSC/SMC Working Group will be in Palm Springs
hosted by Western Digital.  Actual meeting time will be determined by the
X3T10 Plenary.

8.    Adjournment

The meeting was adjourned at 11:37 a.m. on Thursday September 14, 1995.

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