[dba-Tech] Curious about USB thumb drives

[Arthur Fuller]

Thanks, Stuart. I also have a 128GB thumb drive so I think I'll check
whether those spaces are bigger or the same.

On Mon, Mar 7, 2022 at 4:26 PM Stuart McLachlan <stuart at lexacorp.com.pg>
wrote:

> Looks like you fomratted as NTFS.  THat will always take about 91MB on a
> 64GB drive.
> The NTFS filesystem uses a number of internal files including a master
> file table
> ("$MFT"), a recovery log file("$LogFile"), a volume descriptor file
> ("$Volume") etc
> Most of that space is occupied by the pre-allocated  cluster allocation
> bitmap
> ("$Bitmap") that keeps track of what space  is used and what space is free.
>
>
> On 7 Mar 2022 at 13:20, Arthur Fuller wrote:
>
> > After suffering a problem with one of my USB thumb drives, I formatted
> > it (not quick, but regular). The drive is purported to be a 64GB
> > drive. After the format was complete, I clicked Properties and the
> > dialog said: Capacity 64,019, 755, 008 bytes (59.6 GB). Used space =
> > 96, 100, 352 bytes (91.6 MB). So I got what I expected. I'm just
> > curious as to what that 91.6 MB is used for.
> >
> > --
> > Arthur
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-- 
Arthur