Problem 303. Convert Hard Drive marketing sizes to actual data sizes

Created by Alan Chalker

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Hard drive sizes are typically marketed using the decimal meaning of prefixes, whereas RAM uses binary meanings. For example:

A 10 GB hard drive (common only a few years ago) typically has 10,000,000,000 bytes 10 GB of RAM though is equal to 10,737,418,240 bytes

More information about this can be found here.

The problem is to take 2 inputs based upon decimal prefixes (a number representing size and a string representing the units) and output the equivalent size using binary prefixes, as seen below:

[100], 'MB' -> [95.4]
[100], 'GB' -> [93.1]

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Last solution submitted on Jul 08, 2019

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3 Comments

3 Comments

@bmtran (Bryant Tran) on 10 Feb 2012

could you provide some sort of indication as to the precision of said number?

Gunther S on 14 Feb 2012

please fix the errors in the solution check, or at least use consistent precision :/

David Verrelli on 25 Dec 2017

My calculation suggests test 3 should have an answer of approximately 465.661, which is tricky to round to 465.5. (Not impossible, but not obvious/intuitive, and not consistent with answers specified for the other tests.) . . . Why was it like this? My guess is that all three answers were adapted directly from the three rows in the contemporary WP article linked to in the problem statement ( https://en.wikipedia.org/w/index.php?title=Hard_disk_drive&oldid=476051941#Units_of_storage_capacity ), to wit: * 100MB = first row; * 10GB = one tenth of second row; * 500GB = half of last row. This yields the peculiar rounding found in the Test Suite.

Solution Comments

Solution 119671

1 Comment

1 Comment

Jean-Marie Sainthillier on 27 Jul 2012

Sorry but I don't understand your rounding results.

Solution 36013

1 Comment

1 Comment

@bmtran (Bryant Tran) on 10 Feb 2012

I would consider this to be the best solution, though it fails the test cases (only because of the precision of the test suite answers).

Problem 303. Convert Hard Drive marketing sizes to actual data sizes

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Problem 303. Convert Hard Drive marketing sizes to actual data sizes

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