upload module "upload store" question

[nginx.mailinglist]

So i got upload module and upload progress module working after alot of
sweat over the progress module configuration

anyways just have a question about this directive "upload_store" i have in
the conf file

 upload_store "/hdd1/_uploads" 1;


i had to create 10 directories 0-9 in the above, is this really needed?
possible for the temp directory just to be a single one? that would
certainly reduce on the work required on some post upload tasks

just wondering in case i missed something

Regards
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