return this.#data.get(key)?.value ?? undefined;
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For SSDs, it’s different because data storage involves actual electrons being added to (or removed from) the cells during programming/erasing. Electrons do have mass: about 9.11 × 10^-31 kg each. When you write data, you’re typically programming more ‘0’s (adding electrons) from the erased state, all ‘1’s, which is fewer electrons. The electrons are supplied via the power connection, so yes, the drive technically gains mass as you fill it with data.