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SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive — main product image
SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive
SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive
SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive
SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive
SanDisk

SanDisk SDCZ48-064G-UAM46 64GB Ultra USB 3.0 - Flash Drive

★★★★★4.7 (124584 reviews)

Transfer files fast with 64GB of portable storage and USB 3.0 read speeds up to 100MB/s.

$19.89*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The SanDisk Ultra USB 3.0 Flash Drive in the 64GB capacity offers a practical balance of speed, storage, and portability for everyday file transfers. With read speeds reaching up to 100MB/s over USB 3.0, moving documents, photos, and media files to and from the drive is noticeably faster than what USB 2.0 drives can deliver. Full backward compatibility with USB 2.0 ports ensures the drive works with virtually any computer, even if the speed advantage is only realized on USB 3.0 connections.

SanDisk includes its SecureAccess software on the drive, giving users the ability to create a password-protected vault with 128-bit AES encryption for sensitive files. The compact, no-frills design keeps the drive pocketable, though the lack of a protective cap means the connector is exposed when not in use. With a functional operating range of 0°C to 45°C, the drive handles standard indoor environments and moderate outdoor conditions without issue. For users who need reliable, fast-reading portable storage without a premium price tag, the SDCZ48-064G-UAM46 covers the essentials well.

Key Features

Performance/speed: Read speeds up to 100MB/s

Compatibility: USB 3.0 and USB 2.0

SanDisk Secure Access Software Keeps Files Private

Operating temperature-32 - 113 degree Fahrenheit (0 – 45 degree Celsius)

Specifications

Brand
SanDisk
Model
SDCZ48-064G-UAM46
Capacity
64GB
Interface
USB 3.0
USB 2.0 Compatible
Yes
Read Speed
Up to 100MB/s
Security Software
SanDisk SecureAccess
Operating Temperature
0°C to 45°C (32°F to 113°F)

SanDisk Ultra SDCZ48 USB 3.0 Flash Drive (Slider Design, 32GB-128GB) — Editorial Review & Use Cases

The SanDisk Ultra SDCZ48 family (SDCZ48-032G-UAM46 32GB, SDCZ48-064G-UAM46 64GB, SDCZ48-128G-U46 128GB) is SanDisk's capless slider-design USB 3.0 flash drive — eliminates the lost-cap problem common to Ultra Flair (SDCZ73) while delivering similar 100 MB/s read speed. Per Western Digital's official SanDisk Ultra USB 3.0 product family page, the SDCZ48 uses a sliding USB connector mechanism — push the slider to expose the USB connector, retract when not in use. No cap to lose, no exposed connector when in pocket / drawer.

What the SDCZ48 Specifically Wins Over Ultra Flair (SDCZ73)

  • Capless slider design — no removable cap to lose; sliding mechanism protects USB connector when retracted
  • Similar 100 MB/s read speed — SDCZ48 typically delivers ~100 MB/s read (vs SDCZ73 Ultra Flair's 150 MB/s). Marginally slower but adequate for everyday use
  • SecureAccess software bundled (AES-128 encrypted folder protection)
  • 5-year limited warranty
  • USB 3.0 + USB 2.0 backward compatible
  • Plastic body with metal-strip accent — durable enough for daily pocket / key-ring carry
  • USB-A connector — works with most laptops + desktops + USB-A docking stations
  • Cross-platform compatibility — Windows / macOS / Linux / Chrome OS / Android (with USB-OTG via adapter)
  • RescuePRO Deluxe data recovery bundled
  • Available 16GB / 32GB / 64GB / 128GB / 256GB capacities

Where the SDCZ48 Specifically Fits

  • Daily file transfer with high-loss-risk environments — schools, classrooms, conferences where caps frequently lost
  • Pocket / keychain carry — slider design prevents accidental USB exposure
  • IT / repair workflows — slider-protected USB lasts in tool bag
  • Bootable OS install media — Rufus / Media Creation Tool support
  • Backup of important documents — SecureAccess for sensitive files
  • Software / driver portable storage
  • Travel data backup — pocketable + cap-loss-proof for travel use
  • School / classroom file exchange
  • BIOS / firmware update media
  • Office presentation files — quick share between meetings
  • Game ROM / emulator portable storage
  • Cheap gift to non-tech users — easier to use than cap drives

Honest Limits Buyers Should Know

  • ~100 MB/s read vs SDCZ73 Ultra Flair's 150 MB/s. SDCZ48 is slower for read-heavy workloads. For absolute fastest USB 3.0 reading, SDCZ73 wins; SDCZ48 trades speed for capless convenience
  • Write speeds ~15-25 MB/s — slower than read. Multi-GB write workloads (filling the drive) are slow. SanDisk Extreme PRO USB drives have much faster sustained writes
  • Slider mechanism wears over years of repeated use. Heavy daily-use scenarios can see slider stiffness develop over 3-5 years. Still functional but feel less smooth
  • Plastic body — modest durability vs metal Ultra Flair. Drops + heavy use will wear faster than metal-bodied USB drives
  • USB-A only — modern USB-C-only laptops need adapter. For native USB-C, look at SanDisk Ultra USB Type-C (SDCZ48 USB-C variant)
  • No hardware encryption. Sensitive data needs BitLocker / FileVault / VeraCrypt or hardware-encrypted drives (Apricorn Aegis, Kingston IronKey)
  • Counterfeit risk on third-party marketplaces. Buy from Amazon Direct (NOT Marketplace), B&H, Adorama, or SanDisk direct
  • Lower capacity tiers benchmark slightly slower. 32GB variants ~80-90 MB/s read vs 128GB at full 100 MB/s
  • Slider mechanism adds slightly more bulk than capless USB-A drives. Some users prefer the smaller cap-only designs for pocket carry
  • Discoloration of plastic body over years. White / colored plastic can yellow with UV exposure (sun, hot car interior)

Where Buyers Should Look Elsewhere

  • Fastest USB 3.0 (150 MB/s read) → SanDisk Ultra Flair SDCZ73 (metal body, cap design)
  • USB-C native → SanDisk Ultra USB Type-C / Samsung BAR Plus Type-C / Kingston DataTraveler USB-C
  • SSD-class speeds (1,000+ MB/s) → SanDisk Extreme Portable SSD / Samsung T7
  • Hardware-encrypted → Kingston IronKey / Apricorn Aegis
  • Compact capless → SanDisk Ultra Fit USB 3.1 (sub-2cm form factor)
  • Premium write speeds → SanDisk Extreme PRO USB 3.2 SSD-class drives
  • Pure budget → SanDisk Cruzer Blade USB 2.0 (SDCZ50, much cheaper, slower)
  • Higher capacity (256GB+) → SanDisk Ultra Type-C 256GB, Extreme Portable SSD

Sources & Citations

  1. Western Digital (SanDisk), "SanDisk Ultra USB 3.0 product family page," westerndigital.com (accessed 2026-05-18)
  2. Tom's Hardware, "USB 3.0 flash drive comparison and benchmarks," tomshardware.com (accessed 2026-05-18)
  3. The Wirecutter (NYT), "Best USB flash drive buying guide," nytimes.com/wirecutter (accessed 2026-05-18)

Last verified: 2026-05-18

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Pros & Cons

👍 Pros

  • Read speeds up to 100MB/s make large file transfers noticeably faster than USB 2.0 drives.
  • USB 3.0 read speeds up to 100MB/s make file transfers significantly faster than USB 2.0 drives.
  • Backward compatible with USB 2.0 ports for broad device support.
  • Included SecureAccess software provides password-protected encryption without extra cost.
  • Compact, capless retractable design eliminates the risk of losing a separate cover.
  • Included SecureAccess software provides password-protected encryption without extra software purchases.
  • Compact form factor is easy to carry on a keychain or in a pocket.
  • Backward compatible with USB 2.0 for use with older computers and devices.

👎 Cons

  • Write speeds are significantly slower than the advertised read speeds, which can be noticeable with large files.
  • Write speeds are notably slower than the advertised 100MB/s read speed.
  • No cap or built-in cover leaves the USB connector exposed to dust and physical damage.
  • 64GB capacity may be limiting for users who need to carry large media libraries or backups.
  • The compact body can get warm during extended or heavy data transfers.
  • 64GB capacity may be limiting for users who need to transport large video files or disk images.
  • The retractable design can loosen over time with heavy use.
  • No USB-C connector, requiring an adapter for newer devices that lack USB-A ports.

Frequently Asked Questions

With read speeds up to 100MB/s over USB 3.0, it is roughly ten times faster than typical USB 2.0 transfer rates, though actual speeds depend on the host device and file types.
Yes, the drive works with both USB 3.0 and USB 2.0 ports, though transfer speeds will be limited to USB 2.0 rates when plugged into an older port.
SecureAccess is included software that lets you create a password-protected, encrypted folder on the flash drive to keep sensitive files private. It runs directly from the drive without requiring installation on the host computer.
Yes, it is fully backward compatible with USB 2.0 ports, but transfer speeds will be limited to USB 2.0 rates.
It lets you create a password-protected, 128-bit AES encrypted folder on the drive to keep sensitive files private, without needing to install third-party encryption tools.
The drive is rated to operate between 32°F and 113°F (0°C to 45°C), covering typical indoor and moderate outdoor environments.
The 100MB/s figure is the maximum read speed. Write speeds are typically slower, which is standard for USB flash drives in this class.
The drive uses a retractable design, so the connector slides back into the housing for protection without a separate cap that could be lost.

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