SanDisk Ultra microSDHC UHS-I 32GB – 120MB/s A1 Class 10 Memory Card
The SanDisk Ultra microSDHC UHS-I 32GB is a compact flash storage card built for Android smartphones, tablets, action cameras, and dashcams that demand consistent, reliable read performance. With a sequential read speed of up to 120MB/s and an A1 application performance rating, the SanDisk Ultra microSDHC 32GB delivers a practical balance of speed, capacity, and durability for everyday mobile storage expansion.
Read Speed and UHS-I Interface
The SanDisk Ultra 32GB leverages the UHS-I (Ultra High Speed Phase I) bus interface, which supports a theoretical maximum bandwidth of 104MB/s under the standard specification. SanDisk achieves the 120MB/s read speed on this card through proprietary controller technology that pushes beyond the standard UHS-I ceiling — however, realising this speed requires a compatible host device with a UHS-I capable slot.
In practical terms, this translates to transferring approximately 1,000 photos per minute when using a compatible card reader. Write speeds are lower than read speeds, with Class 10 and UHS Speed Class 1 (U1) ratings guaranteeing a minimum write speed of 10MB/s — sufficient for continuous Full HD (1080p) video recording.
Speed Class Ratings Explained
Understanding the three speed class ratings on the SanDisk Ultra 32GB helps clarify its intended use:
- Class 10 (C10): Guarantees a minimum sustained write speed of 10MB/s. This is the legacy SD speed class standard, confirming the card meets baseline requirements for 1080p video.
- UHS Speed Class 1 (U1): The UHS-equivalent of Class 10, also guaranteeing 10MB/s minimum write speed, specifically with UHS-I enabled host devices. U1 supports real-time HD video recording when used with a UHS-compatible device.
- Application Performance Class A1: Guarantees a minimum of 1,500 random read IOPS and 500 random write IOPS. This rating is specifically relevant for Android devices where the card is used as adoptable storage or for storing and running apps directly from the card. A1 performance ensures faster app launch times, smoother loading of in-app assets (graphics, audio, saved profiles), and reduced latency during app operations.
Storage Capacity and Typical Use
At 32GB, the SanDisk Ultra microSDHC 32GB provides storage for:
- Approximately 1,000+ photos at 24MP resolution (JPEG)
- Several hours of Full HD (1920×1080) video footage, depending on the recording bitrate of the device
- App data, media files, WhatsApp downloads, and documents on Android devices
The SDHC format applies to cards from 4GB to 32GB, meaning the SanDisk Ultra 32GB uses the microSDHC standard. Consequently, it requires a host device or reader that supports microSDHC — all modern smartphones and tablets do. The card ships with a full-size SD adapter, making it directly compatible with DSLR cameras, laptops, and desktop card readers that accept standard SD cards.
Durability and Environmental Protection
The SanDisk Ultra microSDHC 32GB is built and tested against five environmental hazards:
- Waterproof – Tested to withstand immersion
- Temperature proof – Rated for operating temperatures from -25°C to 85°C and storage temperatures from -40°C to 85°C, making it suitable for use in Kenya’s varied climates from hot coastal environments to cooler highland conditions
- Shockproof – Resistant to physical drops and impacts
- X-ray proof – Safe to pass through airport security X-ray scanners without data loss
- Magnet proof – Data is not affected by magnetic fields
These ratings reflect standardised environmental testing and are not a guarantee of performance in all extreme scenarios.
SanDisk Memory Zone App Compatibility
The SanDisk Ultra 32GB is compatible with the SanDisk Memory Zone app (available on Google Play), which allows Android users to:
- Monitor internal and external storage usage
- Automatically move media files, downloads, and WhatsApp content to the microSD card
- Back up data from the card to cloud storage services
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