Product Comparison: IronKey D250 vs IronKey S250

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General Specifications
About the Product
D250 drives balance performance and value for users who don’t require constant access to data. Same great security as the S250, with dual-channel MLC flash memory for reliable read/write performance.
High-performance and extra long-lasting S250 drives are built to stand up to continuous use on the road. Dual-channel SLC flash memory delivers exceptional performance and longevity.
Size & Weight
0.35 in.
0.35 in.
2.95 in.
2.95 in.
0.75 in.
0.75 in.
0.9 oz.
0.9 oz.
What customers say about "Size & Weight"
IronKey D250 4GB Secure
  • This is a safe flash drive. You still have a port vulnerability, but this unit is very high quality and easy to carry around.
  • Love it, high quality, speedy enough and portable and light just as common USB Flash.
  • It fits right into a slot on the side of my IBM clone, and I can move files to it. Just as light and portable as I wish.
  • If you have a pc and want to keep sensitive data safe this is an indispensable little device.
  • This is a quality piece of kit - solid, waterproof beyond military standards with very light weight and appearance.
IronKey S250 4GB Secure
  • Everything works without being invasive. Also pretty compact and nice looking.
  • Ruggedized construction is tamper-resistant and tamper-evident. But the looks just as standard little flash drive.
  • A solid, seamless metal enclosure is then filled in with epoxy, protecting it against drops and from attackers, but the device is light and compact.
  • Light and portable device with metal and rubber enclosure.
  • The construction is extremely light and ultra-secure.
4 GB
4 GB
USB Version
Write Speed
13 MB/s
24 MB/s
Read Speed
29 MB/s
31 MB/s
Water, 256-bit AES Cipher-Block, RSA–2048 bit, SHA–256 bit, FIPS 140-2 Level 3
256-bit AES Cipher-Block, RSA–2048 bit, SHA–256 bit, FIPS 140-2 Level 3, Water
Drag-and-drop encryption, Plug-and-play simplicity, Intuitive encrypted backup
Easy to use control panel interface, Easy to deploy and simple to use, No Windows administrative privileges required, No software or drivers to install
What customers say about "Features"
IronKey D250 4GB Secure
  • This is an indispensable tool for those that mean to do serious cybersecurity.
  • You are getting best of breed of protection outside of classified space.
  • This is working great for more-secure storage of personal files. Better peace of mind for storing sensitive data.
  • The drive works very well and I love the personal message capability for finders if lost or warning to those that may attempt to hack the password.
  • Just wish it had both protected and unprotected areas on it.
IronKey S250 4GB Secure
  • Top-notch security, with 256-bit AES hardware encryption in Cipher-Block Chaining mode.
  • Great drive, full of features and includes software for secure Web browsing and password management.
  • The S250 offers some of the strongest encryption available, with FIPS 140-2 level 3 certification.
  • Setting up the drive is simple, done by first opening the drive with the included IronKey Unlocker program.
  • Secure Web-browsing is slow and USB is only 2.0 version.
Warranty / Certifications
Manufacturer Warranty
1 year(s)
1 year(s)
Other Information

Other reviews