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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Use the D: drive as a data drive on a Windows VM
In this articleApplies to: ✔️ Windows VMs If your application needs to use the D drive to store data, follow these instructions to use a different drive letter for the temporary disk. Never use the temporary disk to store data that you need to keep. If you resize or Stop (Deallocate) a virtual machine, this may trigger placement of the virtual machine to a new hypervisor. A planned or unplanned maintenance event may also trigger this placement. In this scenario, the temporary disk will be reassigned to the first available drive letter. If you have an application that specifically requires the D: drive, you need to follow these steps to temporarily move the pagefile.sys, attach a new data disk and assign it the letter D and then move the pagefile.sys back to the temporary drive. Once complete, Azure will not take back the D: if the VM moves to a different hypervisor. For more information about how Azure uses the temporary disk, see Understanding the temporary drive on Microsoft Azure Virtual Machines Attach the data diskFirst, you'll need to attach the data disk to the virtual machine. To do this using the portal, see How to attach a managed data disk in the Azure portal. Temporarily move pagefile.sys to C drive
Change the drive letters
Move pagefile.sys back to the temporary storage drive
Next steps
FeedbackSubmit and view feedback for ReadyBoost
ReadyBoost (codenamed EMD[1]) is a disk caching software component developed by Microsoft for Windows Vista and included in later versions of Windows. ReadyBoost enables NAND memory mass storage CompactFlash, SD card, and USB flash drive devices to be used as a cache between the hard drive and random access memory in an effort to increase computing performance. ReadyBoost relies on the SuperFetch and also adjusts its cache based on user activity. ReadyDrive for hybrid drives is implemented in a manner similar to ReadyBoost.[2] Overview[edit]Using ReadyBoost-capable flash memory (NAND memory devices) for caching allows Windows Vista and later to service random disk reads with better performance than without the cache. This caching applies to all disk content, not just the page file or system DLLs. USB flash devices typically are slower than a mechanical hard disk for sequential I/O, so, to maximize performance, ReadyBoost includes logic that recognizes large, sequential read requests and has the hard disk service these requests.[3] When a compatible device is plugged in, the Windows AutoPlay dialog offers an additional option to use the flash drive to speed up the system; an additional ReadyBoost tab is added to the drive's properties dialog where the amount of space to be used can be configured.[4] The minimum cache size is 250 MB. In Vista or with FAT32 formatting of the drive, the maximum is 4 GB. In Windows 7 or later with NTFS or exFAT formatting, the maximum cache size is 32 GB per device. Windows Vista allows only one device to be used, while Windows 7 allows multiple caches, one per device, up to a total of 256 GB.[5] ReadyBoost compresses and encrypts all data that is placed on the flash device with AES-128; Microsoft has stated that a 2:1 compression ratio is typical, so a 4 GB cache would usually contain 8 GB of data.[6] Requirements[edit]For a device to be compatible and useful, it must conform to these requirements:
Other considerations:
ReadyBoost is not available on Windows Server 2008.[12] Performance[edit]A system with 512 MB of RAM (the minimum requirement for Windows Vista) can see significant gains from ReadyBoost.[13][14] In one test case, adding 1 GB of ReadyBoost memory sped up an operation from 11.7 seconds to 2 seconds. However, increasing the physical memory (RAM) from 512 MB to 1 GB (without ReadyBoost) reduced it to 0.8 seconds.[15] System performance with ReadyBoost can be monitored by Windows Performance Monitor.[16] As the price of RAM decreased and more RAM was installed in computers, the mitigations provided by ReadyBoost to systems with insufficient memory decreased. The core idea of ReadyBoost is that a flash memory (e.g. a USB flash drive or an SSD) has a much faster seek time than a typical magnetic hard disk (less than 1 ms), allowing it to satisfy requests faster than reading files from the hard disk. It also leverages the inherent advantage of two parallel sources from which to read data, whereas Windows 7 enables the use of up to eight flash drives at once, allowing up to nine parallel sources. USB 2.0 flash drives are slower for sequential reads and writes than modern desktop hard drives. Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB 2.0 flash drives but are equal to or slower than USB 3.0 and Firewire (IEEE 1394) for sequential data. USB 2.0 and faster flash drives have faster random access times: typically around 1 ms, compared to 12 ms for mainstream desktop hard drives.[17] On laptop computers, the performance shifts more in favor of flash memory when laptop memory is more expensive than desktop memory; many laptops also have relatively slow 4200 rpm and 5400 rpm hard drives. In the original release of Windows Vista, ReadyBoost failed to recognize its cache data upon resume from sleep, and restarted the caching process, making ReadyBoost ineffective on machines undergoing frequent sleep/wake cycles. This problem was fixed with Vista SP1.[18] Limitations[edit]Since flash drives wear out after a finite (though very large) number of writes, ReadyBoost will eventually wear out the drive it uses. According to the Microsoft Windows Client Performance group, the drive should be able to operate for at least ten years.[3] See also[edit]
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