Clarify between decimal bytes and binary bytes

James C Hatfield james.c.hatfield at
Wed Jul 7 11:09:31 PDT 2010

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T13 encountered this in 2002.
I published e02135r0 on the T13 website. T13 decided to only have it as a
link, and not an actual document.
Furthermore, several attempts since then (by me) to introduce the binary
terms into T13 standards have been overwhelmingly rejected, in favor of only
using the decimal units. As such, T13 standards have no need to refer to the
binary units.
I ask the question of T10: Is there an overwhelming NEED to use the binary
terms ?
If not, then there is no problem, and no need for the references.
Thank You !!!
Jim Hatfield
Seagate Technology LLC
  e-mail:  James.C.Hatfield at
  s-mail:  389 Disc Drive;  Longmont, CO 80503 USA
  voice:  720-684-2120
  fax....: 720-684-2711
On Wed, Jul 7, 2010 at 10:37 AM, Kevin D Butt <kdbutt at> wrote:
> 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
> MB = 10^6) and binary bytes (e.g., MiB = 2^20).  There has been this
> definition in IEC for since Dec 1998.
> References:
> 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
> standards?
> What is the preferred manner in which we should proceed to make sure this
> clarification is added to each standard?
> Thanks,
> 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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