disk

问题 IDE,SCSI,SSD,SATA or all of those. 回答1: I'm surprised: Figure 3 in the middle of this article, The Pathologies of Big Data, says that memory is only about 6 times faster when you're doing sequential access (350 Mvalues/sec for memory compared with 58 Mvalues/sec for disk); but it's about 100,000 times faster when you're doing random access. 回答2: Random Access Memory (RAM) takes nanoseconds to read from or write to, while hard drive (IDE, SCSI, SATA that I'm aware of) access speed is measured

问题 Is is possible to read a disk directly with .Net? By directly I mean via the device bypassing the file system. I think I would go about this by opening the device some way \"\\Device\\Ide\\IdeDeviceP2T0L0-1\" for example. If I can\'t open the device with a .NET api knowing which Win32 API to use would be helpful. 回答1: CreateFile has support for direct disk access. Read the notes under "Physical Disks and Volumes". You should be able to P/Invoke the call. Note that Vista and Server 2008 have

问题 I would like to access information on the logical drives on my computer using C#. How should I accomplish this? Thanks! 回答1: For most information, you can use the DriveInfo class. using System; using System.IO; class Info { public static void Main() { DriveInfo[] drives = DriveInfo.GetDrives(); foreach (DriveInfo drive in drives) { //There are more attributes you can use. //Check the MSDN link for a complete example. Console.WriteLine(drive.Name); if (drive.IsReady) Console.WriteLine(drive

问题 I am trying to generate an archive on-the-fly in PHP and send it to the user immediately (without saving it). I figured that there would be no need to create a file on disk as the data I\'m sending isn\'t persistent anyway, however, upon searching the web, I couldn\'t find out how. I also don\'t care about the file format. So, the question is: Is it possible to create and manipulate a file archive in memory within a php script without creating a tempfile along the way? 回答1: I had the same

问题 What tools or techniques can I use to remove cached file contents to prevent my performance results from being skewed? I believe I need to either completely clear, or selectively remove cached information about file and directory contents. The application that I\'m developing is a specialised compression utility, and is expected to do a lot of work reading and writing files that the operating system hasn\'t touched recently, and whose disk blocks are unlikely to be cached. I wish to remove