1## 8.2\. File I/O Access Performance 2 3Providing a common baseline for a consistent file access performance on the 4application private data storage (`/data` partition) allows app developers 5to set a proper expectation that would help their software design. Device 6implementations, depending on the device type, MAY have certain requirements 7described in [section 2](#2_device-type) for the following read 8and write operations: 9 10 11* **Sequential write performance**. Measured by writing a 256MB file using 1210MB write buffer. 13* **Random write performance**. Measured by writing a 256MB file using 4KB 14write buffer. 15* **Sequential read performance**. Measured by reading a 256MB file using 1610MB write buffer. 17* **Random read performance**. Measured by reading a 256MB file using 4KB 18write buffer. 19 20Handheld device implementations: 21 22 * [H-0-1] MUST ensure a sequential write performance of at least 5MB/s. 23 * [H-0-2] MUST ensure a random write performance of at least 0.5MB/s. 24 * [H-0-3] MUST ensure a sequential read performance of at least 15MB/s. 25 * [H-0-4] MUST ensure a random read performance of at least 3.5MB/s. 26 27Television device implementations: 28 29 * [T-0-1] MUST ensure a sequential write performance of at least 5MB/s. 30 * [T-0-2] MUST ensure a random write performance of at least 0.5MB/s. 31 * [T-0-3] MUST ensure a sequential read performance of at least 15MB/s. 32 * [T-0-4] MUST ensure a random read performance of at least 3.5MB/s.