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Two small black microSDXC cards in clear plastic packaging

Gigastone Corporation

Gigastone 128-4-2 128GB 2-Pack MicroSDXC A2 U3 V30 memory card

SKU CH-X1TE-BBMSJ

Two 128 GB microSDXC cards rated A2, U3 and V30 for 4K video and fast app loading with read speeds up to 100 MB/s and write speeds up to 50 MB/s

  • Total capacity256 GB (128 GB x 2)
  • Memory card formatMicroSD
  • Speed classA2 / U3 / UHS-I / V30
  • Max read speedUp to 100 MB/s
  • Write throughputUp to 50 MB/s
  • Variant2-Pack

Capacity 256GB (128GB x 2)

Series 4K Camera Pro

Model 2-Pack

  • Ready for 4K recording with V30 sustained write speed
  • Faster app launches on phones and tablets thanks to A2 rating
  • Reads up to 100 MB/s for quick file transfers
  • Two 128 GB cards give 256 GB total capacity
  • Five-year warranty includes free data recovery service

Dual-pack microSDXC for 4K capture

Two 128 GB microSDXC cards deliver a combined 256 GB of storage. Rated UHS-I U3 V30 A2, they sustain sequential writes fast enough for uninterrupted 4K video on action cameras, drones and the Nintendo Switch. The A2 rating also accelerates app loading when used in smartphones or tablets.

Passive operation with no thermal concerns

As solid-state memory cards they have no moving parts, draw minimal power from the host device and run completely silent. No active cooling is required and normal use produces no perceptible heat, making them suitable for continuous recording in compact enclosures.

V30 sustained write speed decides suitability

The V30 marking guarantees a minimum 30 MB/s sequential write, the threshold for reliable 4K capture. If your workflow demands sustained writes above 30 MB/s, such as high-bitrate 8K or professional cinema formats, these cards will not meet that requirement.

How it compares

Measured against everything we stock in SD & MicroSD Memory Cards, at today’s prices. Recalculated every night.

Price $74.99
Pricier than about 64% of the 1,947 comparable items (median $46.99).
Total capacity 256 GB (128 GB x 2)
Higher than about 80% of the 1,132 comparable items (median 64 GB).
Price per TB $292.93 per TB
Cheaper than about 61% of the 901 comparable items (median $374.69 per TB).

Specifications

Product
Brand nameGigastone
Product line4K Camera Pro
Model name128-4-2
Part number128-4-2
Total capacity256 GB (128 GB x 2)
Product typeMicroSDXC
Performance
Speed classA2 / U3 / UHS-I / V30
Max read speedUp to 100 MB/s
Write throughputUp to 50 MB/s
Storage
Memory card formatMicroSD
More details
Variant2-Pack

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 128GB MicroSDXC card in my device, and what step do people often miss?

Insert the card label-side up until it clicks into the microSD slot; the step many miss is formatting the card in the device settings before first use to ensure the A2 and V30 ratings work correctly.

What maintenance or replacement will the 128GB MicroSDXC card need over time?

The card has no moving parts, so no routine maintenance is required; replace it if write speeds drop below 50MB/s or if errors appear after heavy 4K recording cycles.

What limit appears first during sustained 4K video recording on this MicroSDXC card?

The sustained write speed ceiling of 50MB/s is the first limit reached during continuous V30 4K capture, capping bitrate before capacity fills.

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