Clarify between decimal bytes and binary bytes

Kevin D Butt kdbutt at
Wed Jul 7 09:37:23 PDT 2010

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I believe that the time has come to clear up confusion in the industry 
about the units used in T10 standards.	There should be a clause added in 
each of the standards describing the difference between decimal bytes 
(e.g., MB = 10^6) and binary bytes (e.g., MiB = 2^20).	There has been 
this definition in IEC for since Dec 1998.
I hesitate to bring in a solo proposal to modify SSC-4 or even SPC-4 when 
this issue should apply to all standards.
Does anybody disagree that T10 should clarify the units being used in our 
What is the preferred manner in which we should proceed to make sure this 
clarification is added to each standard?
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at

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