disco usb 64gb mostra apenas 58.59GB

Question

Eu tenho um pendrive não formatado Kingston Datatraveler Ultimate 3.0 G3 64 GB .

Quando eu limpo o disco e estou prestes a particioná-lo e formatá-lo, ele é listado como 58,59 GB e nas propriedades ele lista apenas 60000 MB.

Eu sei que para os fabricantes de discos 64GB representa 64 × 10 ⁹ bytes. E para o Microsoft Windows é para 64 × 2 ³⁰ bytes.

Mas ainda espero ver minha unidade de 64 GB listada como 64 × 10 ⁹ / 2 ³⁰ ≈59.60GB em vez de 58.59GB. De onde vem essa discerpância?

    

Answer 1

De acordo com o Suporte de tecnologia da Kingston

Kingston tem algumas unidades alocadas em uma área oculta. Muito provavelmente um certo chip com células. Não acessível pelo usuário. Um hack de hardware permitiria que você visse o que realmente está sendo mantido lá.

A área oculta poderia aguentar. Células de reserva para maior vida útil do inversor e o firmware como informações do controlador.

Uma referência ao site está abaixo.

Some of the flash storage device's listed capacity is used for formatting and other functions and thus is not available for data storage, therefore you will not see the full capacity.

When a flash storage device is manufactured, steps are taken to ensure that the device operates reliably and permits the host device (computer, digital camera, PDA, etc.) to access the memory cells; i.e., to store and retrieve data on the flash storage device. These steps, loosely called "formatting," utilize some of the memory cells within the device and thus reduce the capacity available for data storage by the end-user.

Formatting includes the following operations:

Testing each memory cell in the flash storage device.Identifying all defective cells and taking steps to ensure that no data will be written to or read from a defective cell.Reserving some cells to serve as "spares." Flash memory cells have a long but finite lifetime. Therefore, some cells are held in reserve to replace any memory cells that may fail over time.Creating a File Allocation Table (FAT) or other directory. To enable flash storage devices to conveniently store and access customer files, a file management system must be created to allow any device or computer to identify the files stored in the flash storage device. The most common type of file management system for flash storage devices is the File Allocation Table (FAT), which is also used on hard drives.Reserving some cells for use by the flash storage device's controller, e.g., for storing firmware updates and other controller-specific information.Where applicable, reserving some cells for special features. For example, the specification for Secure Digital (SD) cards requires reserved areas to support special copy protection and security features.

FAQ: KDT-010611-GEN-06