[gdal-dev] not enough disk space for gdal_merge even though I have ~1TB free

[Terra Frost]

When I do "gdal_merge -o result.tif bottom.tif top.tif" I get the following
error:

ERROR 3: result.tif: Free disk space available is 1011663560704 bytes,
whereas 61588097799713184 are at least necessary. You can disable this
check by defining the CHECK_DISK_FREE_SPACE configuration option to FALSE.
Creation failed, terminating gdal_merge.


I don't understand. The two TIFs I'm trying to merge are 1.27GB and 64MB
and it's saying 61588097799713184 bytes are needed? That's 61.58 PB. Why
would gdal_merge think it'd need 61.58 PB?
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