If changing the on-disk format is an option, I would suggest h5py <https://docs.h5py.org/en/stable/> which allows to save numpy arrays in HDF5 format. Stefano On 14 May 2021, at 16:22, numpy-discussion-request@python.org<mailto:numpy-discussion-request@python.org> wrote: Aside from writing my own numpy storage file container, I am stumped as to how to fix this, or reproduce this in a consistent manner. Any suggestions would be greatly appreciated! Thank you, Isaac