R. McCarty said:
I believe that the Bin works in a "FIFO", First-in, First-out fashion.
It does.
So if you drop new content into it and it's nearly full, it will purge
out the oldest data stored to make room for the new deletions.
It does, but doesn't warn you. It only warns you when a file is
larger than the reserved space (regardless of any files currently
in the bin).
The
key name is "RecycleBinSize", but I'm not sure even that would
allow you to increase the maximum size.
Regarding the registry hack:
[HKLM\software\microsoft\windows\currentversion\policies\explorer]
"RecycleBinSize"=DWORD:0000000a
The value is the percentage of the drive. The above therefore
represents 10% (the default). Values in excess of 00000064
force the bin to 100%, which would make little sense if the
percentage were a true percentage of the drive's space.
However, rather than allowing you to increase the recycle bin
beyond its 3.99GB limit, this setting actually DISABLES the
sliders, both globally and on individual drives. Probably not
surprising, given that it's a policy...
I believe the limit is due to the limits of 32-bit processing. The
largest integer value you can store within 32-bits is exactly
2^32 - 1 bytes (4GB less one byte), because the value zero
must also be represented. Hence the maximum is shown as
being 3.99GB rather than 4GB (4,294,967,295 bytes instead
of 4,294,967,296 bytes, to be precise).
To my way of thinking, the slider would make far more sense
if it represented a percentage of the maximum 3.99GB rather
than the full partition size. For instance, my 300GB drives only
have three options available to them:
0% (0.00GB)
1% (2.79GB)
2% (3.99GB)
And my 400GB drives have but two options (0GB or 3.99GB).
Personally I have no need for 2.79GB let alone 3.99GB, but I
also don't want to lose the recycle bin altogether (certainly not
on any of my work in progress drives). Just a few hundred
megabytes would more than suffice my needs, but it isn't
an option unless I repartition, which makes little sense given
how few drive letters I have available (B: P: Q: and R

.
Enough of my problems... hope this helps.