128GB = approximately 112GB-120GB

256GB = approximately 225GB-240GB

512GB = approximately 450GB-480GB

1TB = approximately 900GB-960GB

Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1GB = 1.00 Billion bytes.

Note:

Speed based on internal testing. Actual performance may be lower depending on the device, interface, usage conditions and other factors.

1MB=1,000,000 bytes. 1GB=1,000,000,000 bytes. Actual user storage less.

About Package:

100% Original SanDisk TF Card*1(with retail package)

SanDisk Ultra microSD UHS-I Card

Speed:
32GB MicroSDHC, Class10,A1,Max read speed up to 120MB/s;
64GB/128GB MicroSDXC, Class10,A1 Max read speed up to 140MB/s;
256GB/512GB/1TB MicroSDXC, Class10,A1,Max read speed up to 150MB/s;
Speed Test
(1). The speed show on our link is test by Sandisk professional instrument, you'd better use 3.0 interface and 3.0 card reader, then you can get a nice speed. 1 MB per second is calculated as 1,000,000 bytes per second.
(2). Speed is influenced by many different factors, interface, computer condition, test software ,systems ,use , etc .

SanDisk Extreme microSD UHS-I Card

Speed:
32GB MicroSDHC, Class10,A1,U3,V30.

32GBMax read speed up to 100MB/s;Write speed up to 60MB/s
64GB MicroSDXC, Class10,A2,U3,V30.

64GB Max read speed up to 140MB/s;Write speed up to 60MB/s

128GB MicroSDXC, Class10,A2,U3,V30.

128GB Max read speed up to 190MB/s;Write speed up to 90MB/s

256GB/512GB/1TB MicroSDXC, Class10,A2,U3,V30.

Max read speed up to 190MB/s;Write speed up to 130MB/s

Fast enough to keep up with the action
The SanDisk Extreme microSD memory card lets you save time transferring media with read speeds of up it’s ideal for your Android smartphone, action cameras, or drones. This high-performance microSD card handles 4K UHD video recording, Full HD video, and high-resolution photos. Plus, it’s A2-rated, so you can get fast application performance for an exceptional smartphone experience.

Great for capturing 4K UHD Video
Ideal for recording outdoor adventures, weekend trips, or sporting events without skipping frames. With up to 1TB, the SanDisk Extreme microSD UHS-I card lets you capture uninterrupted 4K UHD and Full HD video with its UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) ratings.

SanDisk High Endurance microSD Card

Worry-Free Recording When You Need It With a microSD Card
Designed to record for up to 20,000 hours, the SanDisk High Endurance microSD card gives you the peace of mind that your dash cam, home monitoring or security system will capture crucial footage when it happens, recording and re-recording worry-free. It’s built tough too—ready to record in extreme heat or freezing cold, and it’s shockproof, waterproof and x-ray proof. It’s also rated Class 10, U3 and V30 so it has the speed you need to record in Full HD or 4K. Capacities of up to 256GB let you record and save more video, and read speeds of up to 100MB/s let you transfer that footage fast.

Perfect for your dash cam or home monitoring system in the microSD card class
Built to last1, this microSD card can reliably capture video day after day so you can rest assured that you’ve got your eye on what matters most.

Record in full HD or 4K

Rated Class 10 and video speed U3 and V30, the SanDisk High Endurance microSD card has the speed to record in Full HD or 4K.

Save time with fast backups

The SanDisk High Endurance microSD card has read speeds of up to 100MB/s, so transferring or backing up footage is a snap.

High endurance lets you record and re-record

Writing and rewriting can take its toll on a memory card, but this card is built to stand up to the task. The 256GB capacity card is engineered to handle up to 20,000 hours of worry-free recording.

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