Product highlights:
- 128GB capacity
- UHS Speed Class 3 (recommended for 4K video)
- Video Speed Class V30 (certifies high minimum speed for video)
- data transfer speed: 200MB/s read, 130MB/s write
- durable design
- waterproof up to 3.2 feet for up to 72 hours
- endures temperatures from -13° to 185°F
- tested against wearing out over 10,000 uses
- magnet-proof
- X-ray-proof
- withstands drops up to 16.4 feet
- warranty: 10 years
- MFR # MB-SY128S/AM
- Item # 305MSY128S
What's in the box:
- 128 GB PRO Ultimate SDXC memory card
More details on the Samsung PRO Ultimate SDXC Memory Card

Product Research
Features
Overview: The Samsung PRO Ultimate SDXC memory card lets you store your digital photos and videos, as well as your digital music files and documents. The memory card is compatible with SDXC host devices, including most digital cameras and camcorders, drones, and surveillance cameras with a full-size SD memory card slot. The card is backed by a 10-year limited warranty.
Speed Class Ratings: This PRO Ultimate SDXC card has a UHS-I interface and a UHS Speed Class rating of U3, making it a recommended medium for recording large, mega-pixel photos and 4K Ultra HD video. It has a read speed of up to 200 MB/s and a write speed of up to 130 MB/s. The PRO Ultimate card has a Video Speed Class rating of V30 (requiring a minimum sequential write speed of 30 MB/s).
Capacity: This full-size SD card has a 128 GB capacity which allows you to store the following (approximate totals):
- 4K Video (2160p @ 30 fps; 60 Mbps): 4 hours
- Full HD Video (1080p @ 30 fps; 16 Mbps): 11 hours
- 4K Photos (3840 x 2880; avg. picture size: 5.5 MB): 22,220 photos
- Full HD Photos (2880 x 2880; avg. picture size 4.3 MB): 28,420 photos
Usable Memory: A portion of the card's capacity is used for system files and maintenance. The actual usable capacity of this card is slightly less than the labeled capacity.
Durability: The Samsung PRO Ultimate SDXC card's rugged construction makes the card able to withstand most any condition. It is resistant to the following:
- Waterproof: withstand up to 72 hours in 1 meter depth of seawater
- Temperature: operating temperatures of -25°C to 85°C (-13F° to 185°F); non-operating temperatures of -40°C to 85°C (-40°F to 185°F)
- X-Ray: up to 100mGy (equal to airport X-ray machines)
- Magnetic Fields: up to 15,000 gauss for 30 seconds, or the magnetic field of a high-field MRI
- Shock: withstands shock of up to 1500g (gravitational acceleration)
- Drop: withstands drops up to 5 meters (16.4 feet)
- Wearout: up to 10,000 mating cycles
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Customer Q&A
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A speedy SD card and works great. Faster than another 512GB card that I have with 150MB/s transfer. I shoot one SD card to jpg and another to CRaw so it's great to have this much space. Crutchfield had a great price, and they delivered in half the time they estimated - always a nice surprise!
scott from Upstate, NY