Lab Notes: What’s a ‘Gibibyte,’ Anyway? - austinaress1983

When is two gigabytes non two gigabytes? When you're transferring files hinder and forth between a Mac and PC, that's when. If you've ever jam-packed a 100GB external hard driveway to the brim with data from your MacBook only to quid information technology into a friend's PC and discover what appears to be a gimped 92GB of capacity, you're not alone.

But don't worry, your data hasn't at peace anywhere; the PCWorld Laboratory crowd ran into the same problem newly when unselfish a data set between Mack and PC, and we're here to explain this storage mystery. Live warned, though–in that respect's mathematics involved.

Here in the PCWorld Lab we'Re forever working happening improving our tests to keep step with the demands of consumer applied science. So when the Macworld Research lab squad moved in with USA, it was like the eventual nerd sleepover–except instead of pillow forts, we built new storage testing procedures that unified two disparate testing methodologies.

If you require a take our How We Test page, you'll see that up until recently we were throwing 3.6GB of hard data at all storage unit that crossed our testbeds. But the Macworld guys were testing their storage drives with just 1GB of data and could thence test a greater variety of drives on behalf of their readers.

We wished-for to use identical test files, irrespective of whether we were examination on a Mack operating theater a PC, so we compromised on a rising 2GB data set packed with photos and Johnny Cash albums. But when we started running the new storage tests, what looked like 2GB in Snow Panthera pardus OS X 10.6 turned out to exist only if 1.85GB in Windows 7.

Our data seemed to induce been purloined, and the perpetrator? Why it was binary, devout reader.

After a trifle bit of inquiry we realized that while disc drive manufacturers universally account storage capacity in powers of 10, Windows 7 tranquilize measures data in powers of 2. Since the nighest you can bother 1,000 in exponential binary is 1,024 (2^10), every Windows 7 G (1,000MB) is actually 1,024MB–which should really be referred to A a gibibyte (GiB).

A GiB equals 1.074GB. Macintosh Operating system measured data the homophonic way as Windows does until Snow Panthera pardus, last year's Mac OS X upgrade which (among other improvements) began measuring data in exponents of 10 instead of 2, merely like the force manufactures.

So the truth is that whether your OS reports file size in powers of 10 operating theater powers of 2, your actual data remains the same. For example, if you transfer of training 10GB of images from Snow Panthera pardus to an Coyote State Card, it may be reportable differently along the Windows hard drive you derived them to.

Our tests show OS X is simply more veracious than Windows when it comes to displaying storage capacity; much as America holds to an outdated imperial measurement arrangement, Windows still clings to a binary counting formula in the face of a metric majority.

Adopt PCWorldLab and GeekTech on Twitter.

Source: https://www.pcworld.com/article/502939/labnotes_storage.html

Posted by: austinaress1983.blogspot.com

Share this post