Package & Shipping: Micro SD with full retail packing About capacity: 64GB=approximately 58GB-60GB 1MB=1,000,000 bytes There is calculation difference between manufacturer and our PC, pleaseGoogle 'Memory card capacity' to get more information About Speed: 64GB = Class 10/UHS1= Writing Speed 10MB/s+ (Maximum transfer/reading speed up to 80MB/s under USB3.0) Different computer or card reader will give different speed, USB2.0 and USB3.0 will give different speed. How to perform correct test: Quality Card Reader + Good Computer + H2testw (Do Not Use phone/tablet/SD adapter/computer card slot) Here is real test conducted by our store, we will show you same card gives different speed under different conditions. Test 1: Different card reader shows different speed (USB3.0 gives much higher reading speed, writing speed is similar) Speed will be less than 1MB/s if you use USB1.1 readers SSK-ACER-USB3.0-x Test 2: Different Computer shows different speed (we use same card, 8MB difference due to quick format after each test) **Micro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed. **Up to 40MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors The real memory calculate formula for reference: 8G: (8G * 1000 * 1000 * 1000 ÷ 1024 ÷ 1024 ÷ 1024=7.45G） 16G: (16G * 1000 * 1000 * 1000 ÷ 1024 ÷ 1024 ÷ 1024=14.90G） 32G: (32G * 1000 * 1000 * 1000 ÷ 1024 ÷ 1024 ÷ 1024=29.80G） 64G: (64G * 1000 * 1000 * 1000 ÷ 1024 ÷ 1024 ÷ 1024=59.60G） 128G: (128G * 1000 * 1000 * 1000 ÷ 1024 ÷ 1024 ÷ 1024=119.20G）
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