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An SD card stores files; a SIM card helps a compatible device identify and authenticate a mobile subscription. They solve different problems, fit different device requirements and cannot replace one another.
What is the difference between an SD card and a SIM card?
| What to compare | SD memory card | SIM |
|---|---|---|
| Main job | Removable, nonvolatile storage for photos, video, files and other data. | Subscriber identity and authentication functions used for mobile-network access. |
| What it enables | Additional storage or removable file transfer, if the device supports the card. | Access to a cellular subscription on a compatible device and network. |
| Common form | Full-size SD or microSD card. | A physical SIM application on a UICC, or an eSIM profile stored in supported embedded secure hardware. |
| Compatibility check | Confirm form factor, capacity standard and speed requirements against the device. | Confirm the device, carrier, network and subscription support the SIM or eSIM. |
| Can it replace the other? | No. It does not provide cellular service. | No. It is not general-purpose photo or file storage. |
In everyday speech, “SIM card” usually means the physical card. Technically, the SIM is an application on a UICC that handles subscriber identities and authentication functions, as described in the GSMA glossary.
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What SD card types and capacity labels mean
SD cards come in different physical sizes, including full-size SD and microSD. Their capacity labels refer to standards, not just the card’s shape. The SD Association defines these ranges:
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| Capacity standard | Standard capacity range |
|---|---|
| SD | Up to 2 GB |
| SDHC | Over 2 GB through 32 GB |
| SDXC | Over 32 GB through 2 TB |
| SDUC | Over 2 TB through 128 TB |
These are the SD Association’s standard ranges, not a guarantee that a particular camera, phone or reader supports every card in a range. See its SD standard overview and capacity table.
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SanDisk 128GB Extreme PRO SD UHS-I Card, Up to 250MB/s Read and 120MB/s Write, 4K UHD, Full HD, U3, V30, SDSDXXJ-128G-GSCIN
- CAPTURE LARGER THAN LIFE. Unlock 4K UHD(3) brilliance and pristine high res stills with video speed class ratings of U3 and V30(4).
- SPEED BARRIERS SHATTERED. Save precious moments with blazing read speeds up to 250MB/s(2) and write speeds up to 170MB/s(2) [256GB-1TB capacities(1)].
- MAXIMIZE WITH MASSIVE CAPACITY. Capture for longer and store more with up to 2TB(1) of storage that can hold up to 2,808 minutes of 4K UHD video recorded at 30 fps (641MB/minute)(9).
- DEFY THE ELEMENTS. Unrelentingly resilient, Sandisk SD memory cards are engineered to perform in extreme conditions, despite rough handling and constant use.(6)
- CONTENT MANAGEMENT, SIMPLIFIED. Back up, organize, and transfer everything easily with the Sandisk Memory Zone desktop app,(7) whether you use an SD card slot or a card reader.
How to check whether an SD card will work
Check the device’s manual or manufacturer information before buying. Capacity support and speed requirements vary by device and intended use; the SD Association advises consulting the device documentation for suitable capacity and speed class (SD Association FAQ).
- Check the slot: Confirm whether the device accepts full-size SD or microSD. Do not assume that a card will physically fit just because it is an SD card.
- Check capacity support: Look up the device’s supported SD, SDHC, SDXC or SDUC standards and maximum capacity. The SD Association’s compatibility guidance explains host and card standards; SDUC cards require an SDUC host.
- Check speed requirements: Match the card’s speed class to the manufacturer’s recommendations and your recording or transfer needs.
- Check how the device uses cards: On supported Android devices, setup can offer portable storage or internal storage. Available choices and behavior depend on the device and software; see Android Help.
How to choose between a physical SIM and eSIM
A physical SIM and an eSIM serve the same broad cellular identity and authentication role, but they are provisioned differently. An eSIM profile is stored in embedded secure hardware in a supported device; it does not become expandable file storage. Support depends on the device and carrier, so follow their setup instructions rather than choosing only by card size. The GSMA eSIM explainer describes the embedded approach.
Quick Recap
Bestseller No. 1
Bestseller No. 2
Bestseller No. 4
Best Value
SANDISK 256GB Extreme PRO SD Memory Card, Up to 200MB/s Read Speeds, UHS-I
- Save time with card offload speeds of up to 200MB/s powered by SanDisk QuickFlow Technology (Up to 200MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 512GB and 1TB capacities. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)
- Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately)
- Shot speeds up to 140MB/s (Write speed up to 140MB/s. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec.)
- Perfect for shooting 4K UHD video and sequential burst mode photography (Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site.)
- UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See the SD Association’s official website.)
Rank #4
SANDISK 128GB Ultra microSD UHS-I Card - Up to 195MB/s Read Speed, Full HD Video, V10, U1, C10, A5 - SDSQUJQ-128G-GZ6MA
- EXPAND YOUR STORAGE. Insert your card to add massive storage up to 1.5TB[1] to your Android smartphones and tablets, digital cameras, and laptops.
- SPACE FOR MORE. With expansive capacities up to 1.5TB[1], capture and store hours of Full HD video[4], movies, music, games, photos, and podcasts.
- MOVE FILES FAST. Use your card with the SANDISK QuickFlow microSD UHS-I Card USB-A Reader[6] to achieve up to 195MB/s[2] read speeds [128GB-1.5TB models] and offload your content fast.
- LOAD APPS IN A SNAP. Rated A1[3], the SANDISK Ultra microSD card is optimized for faster app launch and overall app performance.
- EASY CONTENT MANAGEMENT. Easily back up, organize, and transfer your photos and videos with the SANDISK Memory Zone desktop or Android mobile app[5].
Rank #3
SANDISK 64GB Extreme PRO SD Memory Card, Up to 200MB/s Read Speeds, UHS-I
- CAPTURE LARGER THAN LIFE. Unlock 4K UHD(3) brilliance and pristine high res stills with video speed class ratings of U3 and V30(4).
- SPEED BARRIERS SHATTERED. Save precious moments with blazing read speeds up to 250MB/s(2) and write speeds up to 170MB/s(2) [256GB-1TB capacities(1)].
- MAXIMIZE WITH MASSIVE CAPACITY. Capture for longer and store more with up to 2TB(1) of storage that can hold up to 2,808 minutes of 4K UHD video recorded at 30 fps (641MB/minute)(9).
- DEFY THE ELEMENTS. Unrelentingly resilient, Sandisk SD memory cards are engineered to perform in extreme conditions, despite rough handling and constant use.(6)
- CONTENT MANAGEMENT, SIMPLIFIED. Back up, organize, and transfer everything easily with the Sandisk Memory Zone desktop app,(7) whether you use an SD card slot or a card reader.
Rank #2
SanDisk 32GB Ultra 100MBs SDHC Memory Card
- Brand: Sandisk
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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