Re: [PATCH] Bogus LBA48 drives

From: Andries Brouwer
Date: Wed Mar 31 2004 - 13:36:33 EST

Geert Uytterhoeven wrote:

>> Apparently some IDE drives (e.g. a pile of 80 GB ST380020ACE drives I have
>> access to) advertise to support LBA48, but don't.
>> One problem with those drives is that the lba_capacity_2 field in their drive
>> identification is set to 0.

Andre Hedrick replies:

> Actually this issue an errata correction in ATA-6 and changed in ATA-7.
> 48-bit command set support is different than capacity.

Hmm. I read in my copy of ATA7:

6.16.55 Words (103:100): Maximum user LBA for 48-bit Address feature set
Words (103:100) contain a value that is one greater than the maximum LBA
in user accessable space when the 48-bit Addressing feature set is supported.
The maximum value that shall be placed in this field is 0000FFFFFFFFFFFFh.
Support of these words is mandatory if the 48-bit Address feature set is supported.

Do you read differently?
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