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Memory cards

SanDisk Extreme microSDXC 128 GB

A fast, widely available 128 GB card that most cameras accept. It is sold for action cameras rather than for continuous surveillance, and the distinction matters more than the speed figure does.

SanDisk Extreme 128 GB microSDXC card with adapter

SanDisk Extreme microSDXC 128 GB

A fast, widely available 128 GB card that most cameras accept. It is sold for action cameras rather than for continuous surveillance, and the distinction matters more than the speed figure does.

Capacity
128 GB
Read speed
Up to 190 MB/s, stated by SanDisk
Write speed
Up to 90 MB/s, rated V30, stated by SanDisk
Class
A2 application performance
Supplied
SD adapter
Endurance
Standard — not a high-endurance card
Amazon reference
B09X7BK27V
EAN
0619659188450
  • 190 MB/s read stated by SanDisk: footage copies to a computer quickly
  • 128 GB is accepted by almost every camera, including older ones
  • Not a high-endurance card — it is built for bursts, not for being overwritten daily

Best for: A camera recording on events rather than continuously, where the card is written to a few times a day.

≈ $41
Check price on Amazon

Specifications

Capacity
128 GB
Read speed
Up to 190 MB/s, stated by SanDisk
Write speed
Up to 90 MB/s, rated V30, stated by SanDisk
Class
A2 application performance
Supplied
SD adapter
Endurance
Standard — not a high-endurance card
Amazon reference
B09X7BK27V
EAN
0619659188450

This is a very good card that is sold for a different job, and it is worth being clear about which.

What Extreme cards are for

Cameras that fill a card quickly and then stop — an action camera on a weekend, a stills camera on a holiday. High read speed gets the footage off afterwards, and the card spends most of its life idle.

What a security camera does instead

Writes continuously, or on events, and overwrites the oldest footage forever. That is a completely different workload, and it is what high-endurance cards exist for. They are rated in hours of continuous recording rather than in megabytes per second.

When this card is the right one

Event recording, a few clips a day, in a camera you look at occasionally. In that pattern an Extreme card lasts years and costs less than an endurance one.

When it is not

24/7 continuous recording. There the card is rewritten every few days, and it will fail sooner — silently, by simply not recording, which the camera does not report.

The number to ignore

190 MB/s is a read speed. Cameras write. Every modern card writes faster than any camera in this catalog produces data.

Availability

On sale at $40 on the American Amazon store at the time of checking.

Prices and availability are what Keepa reported on the date this page was updated; both move.

Prices quoted in this text were read on September 2, 2026. The live price is at the top of the page.

The questions we are asked

Is an Extreme card wrong for a security camera?

Not wrong, but not ideal. Extreme cards are built for cameras that write in bursts and then sit idle. A security camera overwrites the same card every few days for years, and cards designed for that are sold as high-endurance. For event recording an Extreme card is fine; for continuous recording, buy endurance.

Does 190 MB/s help?

No. That figure describes reading, and a camera only writes. Sustained write speed is the number that matters and it is far lower on every card. Any modern card writes faster than a camera produces data.

More camera memory cards

  • SanDisk Extreme 256 GB microSDXC card

    SanDisk Extreme microSDXC 256 GB

    Twice the capacity of the 128 GB card, which in a camera translates directly into twice the days of history before the oldest footage is overwritten.

    Capacity
    256 GB
    Read speed
    Up to 190 MB/s, stated by SanDisk
    Write speed
    Up to 130 MB/s, rated V30, stated by SanDisk
    Class
    A2 application performance
    Supplied
    SD adapter
    Endurance
    Standard — not a high-endurance card
    Amazon reference
    B09X7CRKRZ
    EAN
    0619659188504
    • Doubles the retention window over a 128 GB card
    • Same SanDisk build and 190 MB/s read figure
    • Some older cameras cap at 128 GB — check before buying

    Best for: A camera whose card fills before you get round to looking at it.

    ≈ $66
    Check price on Amazon
  • Amazon Basics 128 GB microSDXC card with adapter

    Amazon Basics 128 GB microSDXC

    The cheap 128 GB option, quoted at up to 200 MB/s read. Like every general-purpose card it is built for mixed use rather than for the constant rewriting a camera does.

    Capacity
    128 GB
    Read speed
    Up to 200 MB/s, stated by the manufacturer
    Supplied
    SD adapter
    Endurance
    General purpose
    Amazon reference
    B0DB5BW783
    EAN
    0195515054850
    • Cheaper than the 256 GB cards here
    • 200 MB/s read stated — faster on paper than the SanDisk beside it
    • General purpose, not high endurance

    Best for: A second camera, a spare card, or a trail camera that is emptied and reused.

    ≈ $45
    Check price on Amazon
  • Amazon Basics 256 GB microSDXC card

    Amazon Basics 256 GB microSDXC

    The same capacity as the SanDisk Extreme at the same price. Choose on availability and on which brand you would rather trust in a camera you will not check for months.

    Capacity
    256 GB
    Read speed
    Up to 200 MB/s, stated by the manufacturer
    Supplied
    SD adapter
    Endurance
    General purpose
    Amazon reference
    B0DB54VLNC
    EAN
    0195515054874
    • 256 GB at a price that tracks the SanDisk closely
    • 200 MB/s read stated
    • General purpose, not endurance rated

    Best for: Anyone comparing the two 256 GB cards on this page and finding the SanDisk out of stock.

    ≈ $72
    Check price on Amazon

All camera memory cards