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Small black microSDXC card with red label, 128GB

SAMSUNG

SAMSUNG PRO Endurance 128GB microSDXC memory card MB-MJ128KA/AM

SKU CH-X9MH-ECYY3 MPN MB-MJ128KA/AM

A 128 GB microSDXC card rated UHS-I U3 V30 for continuous recording at up to 40 MB/s write and 100 MB/s read

  • TypemicroSDXC
  • Capacity128GB
  • Speed Class RatingUHS-I / U3 / Class 10 / V30
  • Read SpeedUp to 100 MB/s
  • Write SpeedUp to 40 MB/s

Capacity 128GB

  • Fast footage capture with up to 100 MB/s read speed
  • Smooth 4K recording backed by U3 and V30 ratings
  • Ample 128 GB capacity for extended sessions
  • Reliable write performance up to 40 MB/s
  • Built for continuous use in demanding environments

PRO Endurance 128GB microSDXC card

This SAMSUNG PRO Endurance microSDXC card provides 128GB of storage for continuous recording tasks. Rated UHS-I U3 Class 10 V30, it delivers read speeds up to 100 MB/s and write speeds up to 40 MB/s. The card is built for high-endurance use in dash cams, security cameras and action cameras.

Suitable for loop recording and full HD capture

Users who need reliable, sustained write performance for 1080p video loops will find this capacity and speed class appropriate. Buyers who require higher sustained write speeds for professional bitrates should select a card rated for a higher video speed class. Those needing larger storage volumes for extended multi-day recording should consider higher-capacity options.

V30 video speed class rating

The V30 designation guarantees a minimum sequential write speed of 30 MB/s, which is the single specification that determines whether the card can sustain full HD or 4K recording without dropped frames. Verify that your device supports UHS-I and the microSDXC format before purchase.

Highlights

  • Fast footage capture with up to 100 MB/s read speed
  • Smooth 4K recording backed by U3 and V30 ratings
  • Ample 128 GB capacity for extended sessions
  • Reliable write performance up to 40 MB/s
  • Built for continuous use in demanding environments

Specifications

BrandSAMSUNG
SeriesPRO Endurance
ModelMB-MJ128KA/AM
TypemicroSDXC
Capacity128GB
Speed Class RatingUHS-I / U3 / Class 10 / V30
Read SpeedUp to 100 MB/s
Write SpeedUp to 40 MB/s
Shipping weight0.02 kg
Package size153 × 102 × 1 mm

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Questions about this item

Should I pick the 128GB PRO Endurance or a larger capacity?

The 128GB capacity suits daily dash-cam or security-camera loops; choose a higher capacity only if you need longer retention before overwriting.

What does the 100 MB/s read speed mean when the card is in my camera?

The 100 MB/s figure is the maximum sequential read under test conditions; actual offload speed will be lower and depends on your device's UHS-I implementation.

How does the UHS-I / V30 rating affect real-world recording?

UHS-I sets the bus ceiling, while V30 certifies a minimum 30 MB/s sustained write, keeping 4K footage stable without dropped frames.

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