Hi,How can we help?

The difference in calculation between the manufacturer and your PC, please google "storage product capacity" for more info. PC defines 1GB = 1.073741824 billion bytes, while the market defines 1GB = 1.00 billion bytes100% real capacity, via H2testw. Storage device conversion formula: nominal capacity X 0.93 = actual capacity. Capacity Notes： 64GB=approx. 55GB 120GB=approx.111GB 128GB=approx. 119GB 240GB=approx. 223G 256GB = approx.238G 480GB = approx. 446GB 512GB = approx. 476GB 960GB =approx.892GB1TB = approx. 930GB 2TB = approx. 1800GB

Win7 or higher version OS is recommended due to'Disk Management Formatting function is built in the systems. We recommend NTDS disk partition format and DISKGENIUS tool to make drive partition.

PS：Use as SSD Benchm ark to check if SSD has complied with 4K Alianment and already been under AHC model. Otherwise SSD write/read speed performance and response time will be affected.

Win7 or higher version OS is recommended due to'Disk Management Formatting function is built in the systems. We recommend NTDS disk partition format and DISKGENIUS tool to make drive partition.

PS：Use as SSD Benchm ark to check if SSD has complied with 4K Alianment and already been under AHC model. Otherwise SSD write/read speed performance and response time will be affected.

Our test data is just for reference, our test results related to manyfactors, such as the status of hard disk, slot interface type, computer hardware grape, computer system, test platforms, and test software and so on. So, our speed test result will be different with you, hope you can understand.

The new SSD generally need to be formatted in Disk Management.In Disk Management, select"Create and Format Hard Disk Partition", you will find it. If "Not Initialized" is displayed, right clink on the drive and select"Initialize Disk".

In Windows XP, for example, you can divide SSD through the Control Panel / System management Tools / Computer Management /Disk Management, select the installed SSD, and press the right mouse button, press adds a new disk to complete.

Currently, the SSD average erasure feature and built-in error correction mechanism can increase the SSD lifespan. But in general, SSD lifespan depends on how it is been used and the work environment, if a mass and long time large numbers of data have been written or used under a high-temperature environment. it would likely reduce the SSD lifespan.

There are two possibilities in most cases: 
a) Inadequate power supply: you can try attaching the USB connector next to the SSD into the USB slot behind your computer, and make sure your computer has enough power supply for the SSD.To avoid insufficient supply which will cause failure to read the SSD. please do not use USB Hub, extension cords, or other USB devices.
b)Not add new sectors: Please check the Disk Management to confirm whether installed SSD in Windows XP / Vista Win7 operating system.