SanDisk Ultra SD Card 140MBs 64GB

SanDisk Ultra SDXC UHS-I 64GB – 140MB/s Class 10 SD Memory Card

The SanDisk Ultra SDXC UHS-I 64GB targets point-and-shoot cameras, entry-level DSLRs, mirrorless cameras, compact camcorders, and laptops with SD card slots. Under the model number SDSDUNB-064G, this card pushes sequential read speeds of up to 140MB/s, carries Class 10 and U1 ratings for Full HD video recording, and passes four-point environmental testing — all within the standard full-size SD form factor that the vast majority of consumer and semi-professional imaging devices accept natively.

Unlike its microSD counterpart (SDSQUAB-064G), the SDSDUNB-064G omits an A1 application performance rating, reflecting its primary role as a camera and device storage card rather than a smartphone or tablet storage solution. In its place, however, it gains a built-in write-protect switch — a hardware feature that locks the card against accidental writes or deletions, absent from microSD cards entirely.

Read Speed and UHS-I Interface

The SanDisk Ultra 64GB SD card runs on the UHS-I (Ultra High Speed Phase I) bus, which sets a standard ceiling of 104MB/s. SanDisk’s proprietary controller technology drives the SDSDUNB-064G beyond that ceiling, reaching sequential read speeds of up to 140MB/s — provided the host device supports the UHS-I interface. Devices with standard SD (non-UHS) slots cap the card at their own throughput limit rather than the card’s rated maximum.

In practice, the 140MB/s read speed delivers faster image previewing on-camera, quicker file browsing on a laptop, and noticeably faster card-to-computer transfers. Based on SanDisk’s internal testing with images averaging 3.55MB, that speed moves approximately 1,000 photos per minute through a compatible USB 3.0 card reader. Meanwhile, write speeds trail read speeds as they do with all flash storage — the Class 10 and U1 ratings set the minimum write floor rather than a performance ceiling.

Speed Class Ratings Explained

The SDSDUNB-064G carries two speed class designations that directly govern its video recording suitability:

• Class 10 (C10): Sets a minimum sustained write speed of 10MB/s under the legacy SD speed class standard. This floor meets the baseline requirement for continuous Full HD (1080p) video recording at 1920×1080 resolution and applies to all SD-compatible host devices regardless of UHS support.
• UHS Speed Class 1 (U1): The UHS-I counterpart to Class 10, holding the same 10MB/s minimum write speed specifically on UHS-I enabled host devices. U1 actively supports real-time Full HD video recording. That said, shooters requiring 4K should look to a U3/V30-rated card instead — 4K demands a minimum sustained 30MB/s write speed that the SanDisk Ultra does not offer.

Beyond those two ratings, the SDSDUNB-064G does not carry an Application Performance Class (A1 or A2) rating. Those ratings govern random IOPS performance relevant to Android app storage — a use case outside the scope of a full-size SD card entirely.

Full-Size SD Form Factor and the SDXC Standard

The SDSDUNB-064G adopts the standard SD (Secure Digital) physical form factor measuring 31.92mm × 23.91mm × 2.17mm — the format that the vast majority of consumer cameras, camcorders, laptops, and printers with SD slots accept natively. Consequently, no adapter is needed for any of these devices.

At 64GB, the card steps into the SDXC (SD Extended Capacity) standard, which covers cards from 32GB to 2TB. Most modern cameras and laptops support SDXC natively. Older devices — particularly cameras manufactured before 2010 — may only support SDHC (up to 32GB) and will not recognise an SDXC card. For that reason, users with older imaging equipment should verify camera model compatibility before purchase.

In practical storage terms, 64GB comfortably holds:

• Approximately 2,000+ photos at 24MP resolution (JPEG), or around 400+ RAW files from a 24MP camera
• Several hours of Full HD 1080p video depending on the camera’s recording bitrate and codec
• A full day’s shoot across mixed photo and video capture without swapping the card

Write-Protect Switch

Unlike microSD cards, the SDSDUNB-064G carries a physical write-protect switch on the left edge of the card. Sliding the switch to the locked position stops any host device from writing to or deleting from the card — shielding captured images and video from accidental overwriting during card handling, import sessions, or when the card moves into a shared device. Sliding it back to the unlocked position restores full read/write access immediately.

In practice, this feature serves photographers transferring cards between cameras and computers, event shooters who hand cards directly to clients or editors, and archivists preserving card contents before offload.

RescuePRO Deluxe Data Recovery Software

The SDSDUNB-064G ships with a download offer for RescuePRO Deluxe data recovery software — a tool that recovers images, video files, and documents accidentally deleted from the card. Rather than requiring a separate purchase, the offer comes bundled with the card and the software downloads directly from SanDisk’s website. It supports recovery of JPEG, RAW, and common video file formats — a practical safety net for camera users who occasionally format cards prematurely or accidentally delete files in-camera.

Durability and Environmental Protection

To protect captured images and video across demanding shooting conditions, the SanDisk Ultra 64GB SD card passes standardised testing against four environmental stress factors:

• Waterproof – Survives water exposure without data loss, providing a safety margin for outdoor and travel shooting across Kenya’s varied weather conditions
• Temperature proof – Operates across -25°C to 85°C, with a non-operating storage range of -40°C to 85°C. This range spans Kenya’s full climate spread — from the heat of the Rift Valley floor and coastal environments to the cooler highland tea country and Nairobi’s elevated terrain
• Shockproof – Withstands drops and physical impact without data loss
• X-ray proof – Passes through airport security X-ray scanners without corrupting stored data

In contrast to the SanDisk Ultra microSD cards, the full-size Ultra SD range does not include magnet-proof certification in its published specifications — a distinction worth noting for users comparing the two formats.

Device Compatibility

The SDSDUNB-064G serves a broad range of SD-slot-equipped devices:

• Point-and-shoot cameras — virtually all consumer compact cameras accept full-size SD cards and run well on the 140MB/s read speed and U1 write rating for HD video
• Entry-level and mid-range DSLRs — Canon Rebel and EOS series, Nikon D-series, and Sony Alpha APS-C models all accept full-size SD and gain noticeably faster buffer clearing from the UHS-I interface during burst shooting
• Mirrorless cameras with single SD slots — the U1 rating covers Full HD recording; users requiring 4K on mirrorless cameras should verify their camera’s minimum write speed requirement before committing to this card
• Compact camcorders — Full HD recording runs reliably within the C10/U1 write floor
• Windows laptops and Chromebooks with built-in SD readers — the SDSDUNB-064G inserts directly without an adapter and functions as portable storage or a working drive
• Printers and photo kiosks with SD slots — for direct card-to-print workflows without a computer in between

Ultra SD vs Ultra microSD: Key Differences

Buyers familiar with the SanDisk Ultra microSD range will find the following differences in the full-size Ultra SD card:

Who Is This Card Best Suited For?

• Point-and-shoot and compact camera users – The SDSDUNB-064G slots directly into the SD slot of virtually all consumer compact cameras. The U1/C10 rating actively supports Full HD video recording, while 64GB holds a full day of mixed photo and video without a card swap. Additionally, the write-protect switch provides a practical safeguard when the card moves between devices.
• Entry-level and mid-range DSLR shooters – The UHS-I interface and 140MB/s read speed drive faster in-camera buffer clearing during burst shooting and quicker post-shoot transfers to a computer. Furthermore, 64GB comfortably covers a full event shoot at 24MP JPEG without changing cards mid-session.
• Mirrorless camera users shooting Full HD – The U1 rating meets the write speed floor for Full HD recording on most mirrorless cameras. However, users whose camera requires V30 (30MB/s sustained write) for 4K or high-bitrate recording should move to the SanDisk Extreme SD range instead.
• Laptop users needing portable storage – The SDSDUNB-064G inserts directly into laptops with built-in SD slots, adding 64GB of removable storage without an adapter or cable. In addition, the write-protect switch guards archived files against accidental deletion when the card moves between machines.
• Travel and outdoor photographers in Kenya – The four-point durability profile — waterproof, temperature proof (-25°C to 85°C), shockproof, and X-ray proof — covers both the shooting conditions found across Kenya’s terrain and the transit risks of airport security and varied outdoor environments.
• Buyers stepping up from a slower or smaller SD card – Users replacing a Class 6, Class 10 non-UHS, or 32GB card will find the SDSDUNB-064G delivers both a meaningful capacity increase and a real-world read speed improvement — all within the accessible Ultra price tier.

Technical Specifications

Storage and Format

Performance

Speed Class Ratings

Physical and Environmental