You're absolutely right. Thanks for catching that.
Though I've done a fair amount of work in binary I never got so I think
in binary. I bought my first "Hexalator in the mid. '70s. I should have
made more use of my current hexalator while writing this.
Some how I just got thinking about how there are usually more bytes on a
disk than the advertised number of bytes. I was thinking of how hard
drive technical spec's usually say bytes per sector and then guaranteed
number of sectors and if you multiply you get more than the advertised
number. They do that because some sectors are mapped out as bad during
factory test and the left over good ones end up being more than the
advertised number.
However, given how different OSs like to show different numbers (GB vs
GiB) and that can vary depending on how many sectors have been mapped
out, I will just strip the those sort of things out of the article.
Yes, I'm aware of the situation with SSDs. They switch out blocks of
memory all the time and that can lead to security problems.
Have a Great Day!
Pat (tablepc)
On 10/30/19 12:53, Gregory Lee Bartholomew wrote:
Hi Pat:
I just took a peak at your article. It looks good. FYI, I think the following
sentence may be inaccurate:
"These actual capacities are usually slightly larger than the decimal based
number on the box or advertisement."
I always heard that the advertisers INTENTIONALLY use the decimal-based number
because it comes out slightly larger (i.e. 1TB looks better than 931GiB). From
https://en.wikipedia.org/wiki/Hard_disk_drive#Units:
--
Software reports hard disk drive or memory capacity in different forms using
either decimal or binary prefixes. The Microsoft Windows family of operating
systems uses the binary convention when reporting storage capacity, so an HDD
offered by its manufacturer as a 1 TB drive is reported by these operating
systems as a 931 GB HDD. Mac OS X 10.6 ("Snow Leopard") uses decimal convention
when reporting HDD capacity. The default behavior of the df command-line utility
on Linux is to report the HDD capacity as a number of 1024-byte units.
The difference between the decimal and binary prefix interpretation caused some
consumer confusion and led to class action suits against HDD manufacturers. The
plaintiffs argued that the use of decimal prefixes effectively misled consumers
while the defendants denied any wrongdoing or liability, asserting that their
marketing and advertising complied in all respects with the law and that no
class member sustained any damages or injuries.
--
There is a different issue where you might see that *SSDs* are, in actuality,
"slightly larger", but the extra space in that case is not directly accessible
by the user. That extra space is really meant to compensate for manufacturing
defects. Some of the data "cells" can fail prematurely and, rather than have the
drive capacity gradually "shrink" as cells fail, the reserved/hidden cells are
substituted in when needed.
There is also another hidden memory area in SSDs (
https://en.wikipedia.org/wiki/Host_protected_area) that manufacturers and others
use to hide software.
Just FYI,
gb
On Wed, 2019-10-30 at 12:20 -0400, pmkellly@xxxxxxxxxxxx wrote:
I received a review and made changes to: #27 Disk space maths, but I
can't move it back to Review. If I grab it and move it to review, it
just snaps back to In Progress. Is that how I should leave it at this stage?
Have a Great Day!
Pat (tablepc)
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