Improving Performance with ReadyBoost

In the last article I talk a little about ReadyBoost – 7 Steps to Improve Pc Performance -. In this one we are going to in full detail about boosting your PC performance with the feature ReadyBoost.

ReadyBoost is a feature that uses external flash drives as a Hard Disk Cache to boost disk read performance. Supported external storage types are:

·         USB Thumb Drives

·         SD Cards

·         CF Cards

But there a drawback when using ReadyBoost, ReadyBoost will not improve performance when the Hard Disk is reading from a SSD. Windows 7 disable ReadyBoost when reading from a SSD.

When using ReadyBoost, the External storage must meet the following requirements:

• Capacity of at least 256 MB, with at least 64 kilobytes (KB) of free space. The 4-GB limit of Windows Vista has been removed for Windows 7.
• At least a 2.5 MB/sec throughput for 4-KB random reads
• At least a 1.75 MB/sec throughput for 1-MB random writes

The most effective way to determine whether specific storage devices meet ReadyBoost requirements is to test it. Windows Vista and Windows 7 automatic test storage devices when attached. If a storage device fails the test, Windows will automatically retest the storage on a regular basis.

Some devices will show “Enhanced for Windows ReadyBoost” on the packaging, which means that Microsoft has tested the device specifically for this feature. If you connect storage devices that meet these requirements, AutoPlay will provide ReadyBoost as an option.

Alternatively, you can configure ReadyBoost by right-clicking the device in Windows Explorer, clicking Properties, and then clicking the ReadyBoost tab. The only configuration option is to configure the space reserved for the cache. You must reserve at least 256 MB. Larger caches can improve performance, but the ReadyBoost cache cannot be greater than 4 GB on a FAT32 file system or greater than 32 GB on an NTFS file system.

Windows 7 use the Windows SuperFetch algorithm to determine which files should be stored in the cache. SuperFetch monitors files that user’s access (including system files, application files, and documents) and preloads those files into the ReadyBoost cache. All files in the cache are encrypted using 128-bit AES if the flash storage device is removable, but hardware manufacturers can choose to disable encryption on internal, non-removable ReadyBoost devices. Because the ReadyBoost cache stores a copy of the files, the flash drive can be removed at any point without affecting the computer—Windows will simply read the original files from the disk.

ReadyBoost provides the most significant performance improvement under the following circumstances:

• The computer has a slow hard disk drive. Computers with a primary hard disk Windows Experience Index (WEI) Subscore lower than 4.0 will see the most significant improvements.
• The flash storage provides fast, random, non-sequential reads. Sequential read speed is less important.
• The flash storage is connected by a fast bus. Typically, USB memory card readers are not sufficiently fast. However, connecting flash memory to an internal memory card reader might provide sufficient performance.

Computers with fast hard disks (such as 7,200- or 10,000-RPM disks) might realize minimal performance gains because of the already high disk I/O. ReadyBoost will read files from the cache only when doing so will improve performance. Hard disks outperform flash drives during sequential reads, but flash drives are faster during non-sequential reads (because of the latency caused when the drive head must move to a different disk sector).Therefore, ReadyBoost reads from the cache only for non-sequential reads.

ReadyBoost creates a disk cache file named ReadyBoost.sfcache in the root of the flash drive. The file is immediately created for the full size of the specified cache. However, Windows will gradually fill the space with cached content.

To monitor ReadyBoost performance, use the System Tools\Performance\Monitoring Tools\Performance Monitor tool in the Computer Management console and add the ReadyBoost Cache counters. These counters enable you to monitor how much of the cache is currently being used and when the cache is read from or written to. But it does not tell you exactly what performance benefit you are achieving by using ReadyBoost.