How is this different from a big chest?

Storage is unlimited. The chest slots you can see are a working buffer; everything beyond that lives behind it, and only the number on the unit and on the circuit network tells you how much is really there.

Why does the inventory look part-full and stop accepting more?

That is the buffer doing its job, not a bug. A passive provider holds about 90% of its slots and pushes the rest into unlimited storage; a storage unit holds about 10%. The panel beside the chest window shows the split - what bots can reach, and what is in deep storage.

Do I need Memory Storage?

No. It works on its own. If you do have Memory Storage - the original or Memory Storage (Continued) - the technology moves to sit after Memory Units, and the power setting is shared, so one knob tunes both.

Why is there no active provider variant?

An active provider empties itself into storage chests. Backed by unlimited storage it would push forever and bury your network in items nobody asked for.

What happens if it loses power?

It stops moving items and shows the low-power icon. Nothing is lost - the contents sit there until power comes back.

Can I read the contents on the circuit network?

Yes. Each unit publishes its total through a hidden combinator, so wiring the unit gives you the real number including the part you cannot see in the slots.

What happens to my items if I remove the mod?

They go with it, as with any mod that adds entities. Empty the units first, or mine them - a mined unit packs into an item that carries its contents.

Which items can it store?

One type per unit, and nothing that spoils. The unit locks to the first item it receives.

Is this the old Logistic Memory Units mod updated?

No, and the distinction matters. That mod and its two successors are all deprecated, and all three were data-only: each variant was Memory Storage's container prototype cloned into a logistic container under a new name. Memory Storage's script only acts on entities actually named memory-unit, so those clones inherited the look, the slots and the recipe but none of the behaviour - which is why the most recent one's own page says the infinite storage does not work and it is "effectively a big (but finite) chest". This is new code that implements the storage loop itself. The idea, the artwork and the power curve are notnotmelon's.

Where do I report a bug?

https://github.com/restjack/logistic-memory-unit/issues - especially anything where a unit stops absorbing or refilling, or where the number on the unit disagrees with what is actually inside.