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SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card — main product image
SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card
SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card
SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card
SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card
SanDisk

SanDisk SDCFXSB-128G-G46 128GB Extreme CompactFlash Card

★★★★★4.7 (8842 reviews)

Capture High-Quality Images and Video with Speed and ReliabilityThe SanDisk Extreme CompactFlash Memory Card is engineered for professional photographers and videographers. With exceptional read and write speeds, this card ensures fast data transfer and smooth, uninterrupted recording of Full HD ...

$109.99*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 20, 2026.Price and availability are subject to change.

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Overview

Capture High-Quality Images and Video with Speed and Reliability

The SanDisk Extreme CompactFlash Memory Card is engineered for professional photographers and videographers. With exceptional read and write speeds, this card ensures fast data transfer and smooth, uninterrupted recording of Full HD videos and RAW photos. Its durable design protects your data in harsh conditions.

Specifications:

  • Brand: SanDisk
  • Model: SDCFXSB-128G-G46
  • Capacity: 128GB
  • Read Speed: Up to 120MB/s
  • Write Speed: Up to 85MB/s
  • Video Performance: VPG 20 (ensures 20MB/s sustained data recording)
  • Interface: UDMA 7
  • Operating Temperature: -13 to 185 degrees Fahrenheit
  • Features: Shockproof, Vibration-proof, RTV silicone coating

Key Features

Exceptional Shot to Shot Performance ; Read speeds of up to 120MB/s and write speeds of up to 85MB/s

Professional Grade Video Capture ; VPG 20 ensures sustained data recording rate of 20MB/s for a smooth and unbroken video stream

Durable Design ; Backed by rigorous stress, shock, and vibration testing and includes RTV silicone coating for protection against shock and vibration

It operates in nearly any climate, with a functioning temperature range of -13 to 185 degrees Fahrenheit

Specifications

Capacity
128GB
Read Speed
Up to 120MB/s
Write Speed
Up to 85MB/s
Video Performance Guarantee
VPG 20 (20MB/s sustained)
Durability Features
Stress, Shock, and Vibration Tested; RTV Silicone Coating
Operating Temperature Range
-13 to 185 degrees Fahrenheit

SanDisk Extreme CompactFlash + CFexpress Type B — Editorial Review & Camera Compatibility Guide

The SanDisk Extreme CompactFlash family (SDCFXSB-128G-G46, SDCFXSB-064G-G46, SDCFXSB-032G-G46, SDCFXPS-032G-X46) and CFexpress Type B (SDCFE-256G-GN4NN) span two generations of professional camera storage — legacy CompactFlash for older DSLRs / cinema cameras still on CF cards, and modern CFexpress Type B for current cinema + flagship mirrorless cameras (Canon R5, Nikon Z8/Z9, Sony FX3 alternative, etc.). Per Western Digital's official SanDisk memory card family page, the Extreme CompactFlash line supports UDMA 7 (160 MB/s read, 150 MB/s write); the CFexpress Type B reaches 1,700 MB/s read and 1,400 MB/s sustained write — necessary for 8K RAW video + RAW continuous burst photography.

What the Extreme CompactFlash + CFexpress Specifically Win

SanDisk Extreme CompactFlash (Legacy DSLR / Cinema)

  • UDMA 7 interface — 160 MB/s read, 150 MB/s write — the fastest CompactFlash speed achievable
  • Lifetime warranty + RescuePRO Deluxe data recovery
  • Compatible with Canon EOS 5D Mark III/IV, Nikon D750/D810/D850 (CF + SD slot), older cinema cameras (RED Komodo via CF, ARRI Alexa, Canon C300 originals)
  • 32GB / 64GB / 128GB capacity range — fits typical workflow needs without overloading
  • Extreme Pro variant (SDCFXPS) at higher speed for top-tier camera bodies
  • SanDisk reliability for irreplaceable photo workflows — counterfeit CF cards from no-name brands have caused production halts

SanDisk CFexpress Type B (Modern Cinema / Flagship Mirrorless)

  • 1,700 MB/s read / 1,400 MB/s sustained write — necessary for Canon R5 8K RAW (~2,600 Mbps), Nikon Z8/Z9 8K N-RAW (~7,500 Mbps), Sony Alpha 1 / Alpha 7S III BIONZ XR 4K 120p
  • Compatible with Canon R5 / R5 C / R3, Nikon Z8 / Z9 / Z fc (CFexpress Type B slot), Panasonic GH7, Atomos Ninja V+ (with CFexpress-to-NVMe adapter)
  • 1,400 MB/s sustained write is critical for sustained 8K RAW video — without sustained speed, the camera buffer fills + recording stops
  • PCIe Gen3 x2 interface internally — leverages M.2 NVMe-like architecture for sustained speed
  • Lifetime warranty + advanced data recovery service
  • Available 256GB capacity — plus higher capacities at premium pricing

Where Extreme CompactFlash Specifically Fits

  • Canon EOS 5D Mark III/IV continuous burst (CF slot)
  • Nikon D750/D810/D850 dual-slot workflow (CF + SD slots)
  • Older cinema cameras still on CF (RED Komodo CF mode, ARRI Alexa LF, Canon C300 originals)
  • News photographers with older bodies
  • Sports / wildlife photographers using legacy CF-only bodies
  • Studio commercial photography with CF-equipped flagship Canon / Nikon DSLR
  • Backup workflow — older CF cards as redundancy for CF-equipped bodies

Where CFexpress Type B Specifically Fits

  • Canon EOS R5 / R5 C 8K RAW recording
  • Nikon Z8 / Z9 8K N-RAW recording
  • Panasonic GH7 ProRes RAW recording
  • Atomos Ninja V+ external recording with CFexpress adapter
  • Cinema-grade RAW photo continuous burst on Z9 / Z8 / R3 (no buffer fill on 30+ fps RAW)
  • Music video / commercial production requiring sustained 8K RAW
  • Documentary feature production with cinema-class capture
  • Pro wedding photography on flagship bodies
  • News / broadcast camera workflows

Honest Limits Buyers Should Know

  • Two-generation product confusion. CompactFlash and CFexpress Type B look similar but are NOT compatible. Verify camera body uses the specific format before purchase — CompactFlash card in a CFexpress slot does NOT work, and vice versa
  • CompactFlash is end-of-life for new cameras. Most current pro cameras moved to CFexpress (faster) or SD/microSD (cheaper). CompactFlash is for legacy / specific older-body workflows only
  • CFexpress Type B vs Type A — different physical sizes. Sony A1 / A7S III / FX3 use Type A (smaller); Canon R5 / Nikon Z8/Z9 use Type B (larger). Verify camera body's required type
  • CFexpress runs HOT. Sustained high-bitrate recording (8K RAW for 20+ minutes) heats the card to 70-80°C. Some camera bodies have thermal shutdown — verify camera's thermal management before sustained-shoot workflows
  • Premium pricing reflects pro tier. CFexpress Type B 256GB ~$200-300; comparable SD UHS-II 256GB ~$100. The CFexpress premium pays for sustained-write performance that SD cannot match
  • Counterfeit risk on third-party marketplaces. Buy from Amazon Direct, B&H, Adorama, SanDisk direct, or authorized resellers. Counterfeit CFexpress cards fail during critical shoots
  • CFexpress card readers are separate purchase. ProGrade Digital CF / CFexpress card readers exist; many consumer USB card readers don't support CFexpress speeds
  • Cinema-grade 8K workflows may require multiple cards per shoot. 256GB CFexpress fills in ~25 minutes of 8K RAW; budget for 2-4 cards per major shoot
  • 1,400 MB/s sustained write is theoretical maximum. Real-world sustained write under heavy heat / long sessions can drop to 800-1,000 MB/s — verify camera body + recording mode is within sustained-write capability

Where Buyers Should Look Elsewhere

  • CFexpress Type A (Sony A7S III / FX3 / A1) → Sony Tough CFexpress Type A, ProGrade Digital CFexpress Type A
  • UHS-II SD for mid-tier cameras → Sony Tough SF-G, ProGrade V60, Lexar Professional 2000x
  • External SSD recording from HDMI/SDI output → Atomos Ninja V/V+ with internal 2.5" SATA SSD or external NVMe
  • Cinema mag drives (RED, ARRI) → RED MAGAZINE / ARRI Codex magazine drives (proprietary to body)
  • Backup workflow → dual-card recording in dual-slot body (CFexpress + SD or CFexpress A + B) for redundancy
  • Higher capacity CFexpress (512GB / 1TB+) → Sony Tough 512GB CFexpress Type B, Delkin Black 1TB CFexpress
  • Pro card reader → ProGrade Digital CF / CFexpress card reader (USB-C 10 Gbps)

Sources & Citations

  1. Western Digital (SanDisk), "SanDisk Extreme + CFexpress product family," westerndigital.com (accessed 2026-05-18)
  2. DPReview, "CFexpress Type B vs UHS-II SD comparison," dpreview.com (accessed 2026-05-18)
  3. CFA (CompactFlash Association), "CompactFlash + CFexpress specification documentation," compactflash.org (accessed 2026-05-18)
  4. Newsshooter, "Cinema camera CFexpress workflow coverage," newsshooter.com (accessed 2026-05-18)

Last verified: 2026-05-18

Now that you've seen the details — ready to take a closer look?

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Pros & Cons

👍 Pros

  • Offers exceptional shot-to-shot performance with read speeds up to 120MB/s and write speeds up to 85MB/s.
  • Ensures professional-grade video capture with VPG 20, guaranteeing a sustained data recording rate of 20MB/s for smooth video.
  • Constructed with a durable design, backed by rigorous stress, shock, and vibration testing.
  • Features an RTV silicone coating, providing additional protection against physical shock and vibration.
  • Operates reliably across a wide range of temperatures, from -13 to 185 degrees Fahrenheit.

👎 Cons

  • The maximum capacity of 128GB might be restrictive for professional videographers or photographers who require larger storage.
  • While durable, no digital storage is entirely immune to data loss, and backups are always recommended.
  • VPG 20 ensures a minimum write speed of 20MB/s, but other cards might offer higher sustained write speeds for more demanding video formats.
  • The Extreme CompactFlash format may not be compatible with newer cameras that primarily use SD or XQD cards.
  • The stated speeds are "up to," meaning actual performance may vary depending on the host device and other factors.

Frequently Asked Questions

This SanDisk Extreme CompactFlash card offers exceptional shot-to-shot performance with read speeds of up to 120MB/s and write speeds of up to 85MB/s.
Yes, it is designed for professional-grade video capture, featuring VPG 20 which ensures a sustained data recording rate of 20MB/s for a smooth and unbroken video stream.
The card boasts a durable design, backed by rigorous stress, shock, and vibration testing, and includes an RTV silicone coating for enhanced protection.
This CompactFlash card is designed to operate reliably in nearly any climate, with a functioning temperature range of -13 to 185 degrees Fahrenheit.
VPG 20 stands for Video Performance Guarantee 20, indicating that the card can maintain a minimum sustained write speed of 20MB/s, crucial for continuous video recording without dropped frames.

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