HP X911S Flash drive

Read Performance: 1TB: up to 500 MB/s 256GB/ 512GB: up to 410 MB/s 256GB-1TB sustains in 400 MB/s Write Performance: 128GB/ 1TB: up to 450 MB/s 256GB/ 512GB: up to 300 MB/s 256GB-1TB: sustains in 200 MB/s Data from PNY and HP offical website,Speed is depend on host device, interface, usage conditions and the type of your device Feature: Support System: Windows 11,10, 8, 7, Vista, XP / Mac OS 10.4 or higher / Linux 2.6.31 or higher. Support Device: Computer/Laptop/Smart TV/TV Box/Car Media Player and etc. About use: Plug and play (no software needed) Body:Metal Boday.Dustproof,Shockproof, Weight: Approximately 21g. Size: L 74.2mm x W 19.9mm x H 7.8mm About Capacity : 256GB Approximately 238 GB. 512GB Approximately 476 GB. 1TB Approximately 930 GB. Vendors are using decimal arithmetic: 1MB = 1000KB, 1G = 1000MB calculated, but the operating system is using binary arithmetic: 1MB = 1024KB, 1GB = 1024MB. So there are some differences between display capacity and nominal capacity of flash memory products.