About capacity: 512GB=approximately 468GB-482GB 1024GB=approximately 926GB-960GB 1GB=1,000,000,000 bytes. Due to different capacity algorithms and partial capacity are used for system files, management and performance optimization, so the actual available capacity may be less than the identifying capacity. Package Include: 1* 512GB Memory Card And a memory Card Adapter 1* 1024GB Memory Card And a memory Card Adapter Warm Tips: 1.Our Store offers genuine memory card with 1 year warranty. 2.Please don't use cheap card reader to test memory card, speed of memory card will be reduced by low quality card reader. 3.Memory card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will slow down card speed. 4.If you have any questions or dissatisfaction with the product, please contact us directly through Amazon, we will definitely give you a satisfactory answer! Thank you for visiting!