GNU bug report logs - #15056
Please indicate the meaning of block sizes in filesystem information

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From: Pádraig Brady <P <at> draigBrady.com>
To: Filipus Klutiero <chealer <at> gmail.com>
Cc: 15056 <at> debbugs.gnu.org
Subject: bug#15056: Please indicate the meaning of block sizes in filesystem information
Date: Fri, 09 Aug 2013 05:53:32 +0100

On 08/09/2013 05:35 AM, Filipus Klutiero wrote:
> Severity: wishlist
> 
> stat -f provides information on the filesystem, including block sizes:
>> Block size: 4096       Fundamental block size: 4096
> The unit used in unfortunately not specified. Considering the fdisk output I get...
>> Sector size (logical/physical): 512 bytes / 512 bytes
>> I/O size (minimum/optimal): 512 bytes / 512 bytes
> ... I guess bits are the unit.

always bytes

There are generally 3 layers of block sizes between the file system and device:

1. physical	defined by the hardware device
2. logical		the smallest addressable unit used for the device
3. file system	ditto for the file system

So your numbers above are not the same item being represented.
They're all in bytes and represent different values 1,2,3 above

thanks,
Pádraig.

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