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The largest microSD card documented in the official product sources cited here is 2TB: SanDisk lists a 2TB Extreme microSDXC UHS-I card. That reaches the SDXC standard’s 2TB limit. SDUC supports capacities up to 128TB, but that is a standard ceiling—not evidence that a 128TB microSD card is commercially available.
What does the largest microSD card mean?
There are two different answers: the largest capacity allowed by a card standard and the largest capacity documented for an actual product. The SD Association’s standards describe what the formats can support; manufacturers determine when cards at those capacities enter the marketplace. The official product sources cited here document a 2TB SanDisk card, not a 128TB product.
| Format | Capacity range | What the figure means |
|---|---|---|
| SDXC | Over 32GB through 2TB | SDXC’s maximum capacity is 2TB. The SD Association specifies exFAT for SDXC. SD Association capacity overview |
| SDUC | Over 2TB through 128TB | 128TB is the SDUC standard’s upper limit, not a verified retail product capacity. The SD Association specifies exFAT for SDUC. SD Association capacity overview |
These figures are standards specifications; the SD Association does not state a publication year for them on its capacity page. The Association says manufacturers decide when larger cards reach the marketplace. SD Association FAQ
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SanDisk’s Extreme microSD UHS-I product page lists capacity up to 2TB, and its data sheet identifies the 2TB option as microSDXC UHS-I. The data sheet is marked ©2024. Together, those official product materials support describing this as a documented 2TB microSD product; they do not establish a complete worldwide inventory of every manufacturer or retailer.
#1 Best Overall
- Compatible with Nintendo-Switch (NOT Nintendo-Switch 2)
- Expand your storage in a flash: ideal for Android smartphones and tablets, Chromebooks, and Windows laptops.
- Increase your TV show, movie, and Full HD video recording collections dramatically with up to a massive 1.5TB. (Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. See SanDisk official website for more info. 1GB=1,000,000,000 bytes. 1TB=1,000,000,000,000 bytes. Actual user storage less.)
- Transfer files fast with up to 150MB/s read speeds and SanDisk MobileMate USB 3.0 microSD card reader. (Engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speed. Based on internal testing; performance may be lower depending on host device, interface, usage conditions, and other factors. 1MB=1,000,000 bytes. Reader sold separately.)
- Load apps faster with A1-rated performance. (A1 performance is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type, and other factors.)
SanDisk Extreme microSD UHS-I product page · SanDisk Extreme microSD data sheet
Will a 2TB microSD card work in your device?
Not necessarily. A device must support SDXC and the card’s capacity, and its required speed class depends on what you use it for. Check the exact device’s user manual before buying; the SD Association likewise advises following the device manual for a suitable capacity and speed class. SD Association FAQ
Rank #2
- EXTREME PERFORMANCE: U3, V30 speed class performance with read speeds up to 200MB/s, and write speeds up to 150MB/s when used with PNY Performance Prime microSD Card Reader¹
- RECORD & TRANSFER: Record and transfer videos, photos, music, files and more from microSD enabled host devices such to laptop and desktop computers using the Performance Prime Card Reader for extreme speeds facilitating accelerated workflows when editing content
- RATED A2 APP PERFORMANCE: A2 App Performance enables apps to run directly from the microSD card, delivering faster app launch and performance. A2 provides minimally 4000 IOPS (Read) and 2000 IOPS (Write)
- USE WITH LATEST DEVICES: Compatible with Android smartphones and tablets, action and surveillance cameras, drones, computers and more (Not compatible with Nintendo Switch 2)
- SD COMPATIBILITY: Included SD adapter for compatibility with SD enabled host devices including DSLR cameras, video cameras, desktops, and laptops
- SD and SDHC devices do not support newer SDXC cards.
- An SDXC-compatible device can support SDXC, SDHC, and SD cards.
- Do not assume that a device supports the full 2TB SDXC limit merely because it accepts microSD cards; look for its stated maximum capacity and supported card types in the manual.
What about speed?
SanDisk advertises up to 240MB/s read and 140MB/s write for the 2TB version. These are conditional manufacturer specifications, not guaranteed real-world results: the data sheet says performance can be lower depending on the host device, interface, usage, and other factors. The advertised read maximum also exceeds the 104MB/s UHS-I standard barrier and depends on compatible equipment. Match the card’s speed class and interface to the device and workload rather than choosing by capacity alone. SanDisk Extreme microSD data sheet
Is a 128TB microSD card available?
The SDUC standard allows capacities up to 128TB, but a standard’s limit does not mean a card at that capacity is on sale. The official product sources cited here document a 2TB card; they do not document a 128TB microSD product. Treat 128TB as the SDUC ceiling, not a purchase option established by these sources.
Quick Recap
Best Value
- Outstanding preserve & transfer performance, the read & write speed is up to 160MB/s and 110MB/s
Rank #4
- Compatible with Nintendo-Switch (NOT Nintendo-Switch 2)
- Save time with card offload speeds of up to 190MB/s powered by SanDisk QuickFlow Technology (Up to 190MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires 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. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, 400GB, 512GB, and 1TB capacities. 1GB=1,000,000,000 bytes and 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)
- Up to 130MB/s write speeds for fast shooting (Based on internal testing; performance may be lower depending upon host device interface, usage conditions and other factors. 1MB=1,000,000 bytes.)
- 4K and 5K UHD-ready with UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (Compatible device required. Full HD (1920x1080), 4K UHD (3840 x 2160), and 5K UHD (5120 X 2880) support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site. UHS Speed Class 3 (U3) designates a performance option designed to support real-time video recording with UHS-enabled host devices. 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 #3
- SanDisk Ultra microSDXC UHS-I 1.5TB Memory Card - Up to 150MB/s, C10, U1, Full HD, A1, MicroSD Card - SDSQUAC-1T50-GN6MN
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