This message is from the T13 list server.
OK. Let me summarize what appears to have been said.
Tell me if this does not correctly reflect the current discussion.
bit 10 words capacity
word 83 100-103 < 137GB Valid? Reason why invalid
----------- ------------ -------------- -------------
------------------------------------------------------
0 0 no no
48-bit must be set if cap>137GB
0 0 yes yes
0 non-zero no no 48-bit
must be set if cap>137GB
0 non-zero yes ??? (in
question)
1 0 no no
SHALL report real capacity if 48-bit supported
1 0 yes no
SHALL report real capacity if 48-bit supported
1 non-zero no yes
1 non-zero yes ??? (in
question)
If so, then the real question is what should we do with ID words 100-103
for the 'in question' cases.
-----------------
The IDENTIFY DEVICE description says that words 100-103 are
* 'optional' if the 48-bit address feature set IS NOT supported
* 'mandatory' if the 48-bit address feature set IS supported
It seems pretty clear to me that in words 100-103
* a 48-bit drive SHALL legally report capacity<137GB
It makes sense to me that in words 100-103
* a 28-bit drive MAY legally report non-zero capacity
----------------
The only question (for me) is whether to CHANGE the wording for words
100-103
from: "is mandatory if the 48-bit Address feature set is supported."
to: "is mandatory if the 48-bit Address feature set is enabled."
-----------------
Feedback ???
Thanx !!!
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Jim Hatfield
ATA Interface Firmware
Seagate Technology - PSG
e-mail: [EMAIL PROTECTED]
s-mail: 389 Disc Drive; Longmont, CO 80501 USA
voice: 720-684-2120
fax : 720-684-2711
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