SanDisk Ultra Card Class 10 256GB UHS-I
Optimized Technical Specs
| Specification | Details |
| Capacity | 256 GB (formatted ~238 GB) |
| Card Type | microSDXC |
| Bus Interface | UHS‑I (SDR104, theoretical max ≈104 MB/s) |
| Speed Classes | Class 10 (≥10 MB/s), UHS Speed U3 & V30 (≥30 MB/s sustained), Application A1/A2 (for app performance) |
| Read Speed | Up to 100–200 MB/s, depending on model |
| Write Speed | ≥30 MB/s sustained; premium cards support 85–140 MB/s burst |
| File System | exFAT |
| Operating Temp | −25 °C to +85 °C |
| Storage Temp | −40 °C to +85 °C |
| Operating Voltage | 2.7–3.6 V |
| Form Factor | 15 × 11 × 1 mm |
| Durability Ratings | Waterproof, shockproof, X‑ray proof, magnet proof (some offer temperature/magnetic/drop/wearout proof) |
| Insertion Cycles | ≥10,000 typical |
| Adapter | Includes SD adapter (full-size) for cameras and readers |
Example Models & Real‑World Specs
SanDisk Extreme Pro 256 GB
- Interface: UHS‑I U3, V30, A2
- Performance: Read up to 200 MB/s, Write up to 140 MB/s
- Durability: Waterproof, shock, X‑ray, temperature proof
- Adapter: Included
SanDisk Extreme (non‑Pro)
- Speed: Read 190 MB/s, Write 130 MB/s
- Ratings: Class 10, U3, V30, A2; 4K video and apps friendly
- Build: Rugged with waterproofing etc.
Transcend 340S 256 GB
- Speed: Read ≈160 MB/s, Write ≈125 MB/s
- Ratings: U3, V30, A2; meets A2 IOPS thresholds
- Protection: Waterproof, shock, X‑ray, static-proof
Samsung EVO Plus 256 GB
- Speed: Read up to 130 MB/s
- Ratings: U3, V30, A2; 10‑year warranty
- Durability: Withstands harsh conditions (water, temperature, X‑ray, magnetism)
ADATA Speed Plus 256 GB
- Peak Speed: Read 180 MB/s, Write 160 MB/s
- Ratings: Class 10, U3, V30, A2; rugged proofing
Key Feature Takeaways
- Interface: UHS‑I ensures up to ~104 MB/s bus speed Endurance Speed: U3/V30 ensures ≥30 MB/s sustained, ideal for 4K recording
- Burst Speed: High-end models reach 140 MB/s write for fast file transfers
- App Performance: A2 boosts random IOPS—great for apps, gaming, Raspberry Pi usage
- Durability: Rugged ratings ensure reliability under extreme conditions
- Software: Many are bundled with data recovery tools and long coverage periods
Recommendations by Use Case
| Use Case | Ideal Model | Why |
| High-speed continuous shooting / 4K video | SanDisk Extreme Pro | 200 MB/s read, 140 MB/s write, A2, rugged |
| General 4K & app use | SanDisk Extreme or Samsung EVO Plus | Fast (130–190 MB/s), good durability, A2 |
| Value with performance | Transcend 340S or ADATA Speed Plus | 160–180 MB/s+, A2, proofing, solid bang for buck |



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