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Memory cards

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.

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

Specifications

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

Capacity in a security camera is not storage. It is time.

What doubling the card actually buys

Days. A camera overwrites its oldest footage when the card is full, so the capacity decides how far back you can look. If your camera fills a 128 GB card in five days, a 256 GB card gives you ten — and ten days covers a holiday where five does not.

That is the whole reason to buy the larger card.

The compatibility check

Look up your camera’s maximum card size before ordering. Older cameras cap at 128 GB, and a larger card in one of them either is not recognized or behaves strangely. It is the commonest reason cards come back.

What it does not change

Endurance. This is the same class of card as the 128 GB version, and in a continuously-recording camera it wears at the same rate per write. A larger card is rewritten less often, which helps a little; a high-endurance card is what actually addresses it.

Availability

On sale at $61 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

Will my camera take 256 GB?

Check the manual. Cameras publish a maximum card size and older ones frequently stop at 128 GB — a larger card in such a camera either is not recognized or behaves unpredictably. It is the first thing to confirm and the commonest reason a card is returned.

Does more capacity mean better?

It means more days before the oldest footage is overwritten, which is exactly what most people want. A bigger card in the same camera is also rewritten less often, which delays its wear, but endurance rating is what actually governs longevity.

More camera memory cards

  • 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
  • Lexar Blue 512 GB microSDXC memory card for security cameras

    Lexar Blue microSDXC 512 GB

    The only 512 GB card on this shelf, for the cameras that state 512 GB as their limit. Lexar lists up to 160 MB/s read, A2 and IPX7; it had no US seller when we checked.

    Capacity
    512 GB
    Read speed
    Up to 160 MB/s, stated by Lexar
    Write speed
    Not stated on the listing
    Bus
    UHS-I
    Class
    A2
    Durability
    IPX7 waterproof, temperature-, X-ray- and shock-resistant (1.5 m drop), stated by Lexar
    Endurance rating
    None stated, general purpose
    Amazon reference
    B0DSVTSTY4
    EAN
    4895217918493
    • 512 GB, the highest limit cameras in this catalog publish
    • The longest recording window you can fit in one of those cameras
    • No US seller on Amazon.com when we last checked

    Best for: A camera whose maker states 512 GB support, recording continuously, where a long recording window is the point.

    Check price on Amazon

All camera memory cards