Nano Memory (NM) is a proprietary flash memory card format developed by Toshiba that matches the dimensions of a nano‑SIM card (12.3 mm × 8.8 mm × 0.67 mm). The format was introduced in 2019 as a compact alternative to microSD cards for mobile devices, allowing manufacturers to save internal space by using a single slot for both SIM and storage functions.
Design and specifications
- Physical size: 12.3 mm × 8.8 mm × 0.67 mm, identical to a nano‑SIM.
- Capacity: initially released in 64 GB and 128 GB capacities; later versions have reached up to 256 GB.
- Interface: UHS‑I (Ultra High Speed) bus, compatible with the SD card protocol, enabling read speeds up to 150 MB/s and write speeds up to 80 MB/s (manufacturer‑specified).
- Compatibility: Supported by select smartphones and tablets that include a dedicated Nano Memory slot, most notably the Sony Xperia 10 II, Xperia 10 III, and certain models from other manufacturers.
Historical context
Toshiba announced Nano Memory in January 2019, positioning it as a space‑saving solution for ultra‑thin smartphones where a separate microSD slot would increase device thickness. The format was marketed as “the world’s smallest memory card” at the time of release. Early adoption was limited to a few flagship devices; broader market uptake has remained modest compared to the entrenched microSD ecosystem.
Advantages and limitations
- Advantages: Small form factor reduces design complexity; single slot can house either a SIM or storage card, simplifying user configuration.
- Limitations: Proprietary nature restricts availability to devices that explicitly include an NM slot; fewer third‑party manufacturers produce NM cards, leading to higher cost per gigabyte relative to microSD cards.
Current status
As of 2024, Nano Memory remains a niche format. While some newer models continue to offer NM support, many manufacturers have reverted to or continued using microSD slots, or have eliminated expandable storage altogether in favor of internal UFS storage. No publicly released specifications indicate further extensions beyond 256 GB capacity.
