This is confusing:

To adjust application settings for real-time stream recording/playback to recover from a fatal error, estimation of

the expected time length for the command is necessary. Group 3 timeout is defined for this purpose. The

Group 3 timeout duration = Group3 time unit × CI(Transfer length / Unit length) + trace time for requested

sectors where:

1. Group 3 time unit is the maximum time to read or write one sector.

2. Unit length is the number of sectors that may be read or written within one Group 3 time unit.

3. Trace time is the time to read or write a sector excluding access time and the read/write time of the first

sector.

The Group 3 time unit shows the maximum time of an operation when the transfer length field is set to 1 and

when Power state of the Drive is Active state. In the case of DVD-RAM, the Group 3 time unit value should

include Zone transition time.

The recommended value for Group 3 time unit is 1 to 5 seconds. The recommended value for Unit length is 256

sectors.

It is recommended that transfer length and verification length are set to smaller than the Unit length value. If the

host uses transfer length less than the Unit length, the Group 3 timeout duration is almost the same as the

Group 3 time unit as follows: (in the case of DVD, 256 sectors is only 0.38 second at 1× speed.)

Group 3 timeout duration = Group 3 time unit + trace time for requested sectors

The Group 3 time unit shall not be changed by a medium change. A Drive may accept the value changed by

the host.

The value for Unit length is specific to the media type. A Drive should adjust the Unit length value according to

the mounted media type.

Group 3 timeout duration of Group 3 timeout has following three exceptions.

1. Exception 1: Initial OPC time

2. Exception 2: Synchronize cache time

3. Exception 3: Power state transition time to Active state

The host is able to control the occurrence of these exceptions by commands (e.g., SEND OPC INFORMATION

command, SYNCHRONIZE CACHE command). The Drive need not treat these exceptions as errors.

If Group 3 timeout is supported, G3tout bit of VERIFY (10) command shall be supported.

Group 3 time unit value shows the maximum time of operation when the transfer length field is set to 1 and

when Power state of the Drive is Active state. In case of DVD-RAM, Group 3 time unit value should include 1

zone transition time.

The recommended value for Group 3 time unit is 1 to 5 seconds. The recommended value for Unit length is 256

sectors.

It is recommended that transfer length and verification length be smaller than the Unit length value. If the Host

uses transfer length less than Unit length, the Expected time is similar with Group 3 time unit. That is, Expected

time = Group3 time unit + trace time for requested blocks.

Which of the two is the text to keep, which is to discard?

Best regards,

David Burg

Research Software Engineering Lead

Tel.: +1 425 707 8769