disk

FindFirstVolume does not return EFI system partition

由 ╄→гoц情女王★ 提交于 2019-12-08 04:32:07
问题 I am using FindFirstVolume/FindNextVolume to get a list of all volumes on a machine. That works well enough, but strangely the EFI system partition is skipped for some reason. Diskpart, on the other hand, returns the EFI system partition and the Disk Management UI shows it, too. Here is diskpart's output: DISKPART> list volume Volume ### Ltr Label Fs Type Size Status Info ---------- --- ----------- ----- ---------- ------- --------- -------- Volume 0 C NTFS Partition 476 GB Healthy Boot

five minutes rules - the price of one access of disc I/O

由 给你一囗甜甜゛ 提交于 2019-12-08 01:04:18
问题 This is very interesting topic, they use following formula to compute access interval time: BreakEvenIntervalinSeconds = (PagesPerMBofRAM / AccessesPerSecondPerDisk) × (PricePerDiskDrive / PricePerMBofRAM). It is derived using formulas for the cost of RAM to hold a page in the buffer pool and the cost of a (fractional) disk to perform I/O every time a page is needed , equating these two costs, and solving the equation for the interval between accesses. so the cost of disc I/O per access is

Picasso doesn't cache image on disk

由 非 Y 不嫁゛ 提交于 2019-12-07 12:37:14
问题 I have to use custom OkHttpClient so I can add headers to the image requests. The problem is Picasso won't cache any images on disk because of this. I've used setIndicatorsEnabled(true) to check caching and I see only red indicators. When I use default OkHttpDownloader all is ok. Below is my Picasso initialization code. So does anyone encounter the same problem? public static void init(Context context) { Picasso.Builder builder = new Picasso.Builder(context); OkHttpClient client = new

Does disk caching with NSURLRequest and NSURLConnection actually work on the iPhone?

由 ぐ巨炮叔叔 提交于 2019-12-07 07:30:50
问题 I have a UITableView whose cells contain custom ImageViews that asynchronously load the images from the internet. To load those images I use NSURLRequest and NSURLConnection which works fine. The only problem is that the images are not cached and therefore are downloaded every time they are used. I tried to set the cachePolicy of the NSURLRequest to "NSURLRequestReturnCacheDataElseLoad" with no effect. It seems from the last answer on link that disk caching is not supported with NSURLRequest

How can the block size of a file store be portably obtained in Java 7?

由 时光总嘲笑我的痴心妄想 提交于 2019-12-07 07:29:07
问题 I've looked at java.nio.file.attribute.Attributes and java.nio.file.FileStore , but couldn't find a way to discover the block-size of a disk-file. 回答1: Here is an article on buffer size vs I/O throughput. Synopsis: nio handles all of that for you. This SO post concludes you should use a power of 2. 来源： https://stackoverflow.com/questions/3892186/how-can-the-block-size-of-a-file-store-be-portably-obtained-in-java-7

Laravel 5.1: ErrorException in file_put_contents() error,possibly out of free disk space

由 泄露秘密 提交于 2019-12-07 07:04:54
问题 This error arrived all out of a sudden. ErrorException in D:\xampp\htdocs\pckg\vendor\laravel\framework\src\Illuminate\Filesystem\Filesystem.php line 81: file_put_contents(): Only 0 of 3520 bytes written, possibly out of free disk space 回答1: I just freed / cleared the laravel.log file in the storage/logs folder. Also clearing cache & sessions folders in storage/framework folder can help. It just cleared the error and the login page was loaded again ! 回答2: The main issue is laravel.log file.

What's the fastest way to read/write to disk in .NET?

由 妖精的绣舞 提交于 2019-12-07 04:30:54
问题 I've got a little program that reads and writes files on disk. Breaking it down to the most simple level, it reads bytes from one file stream and writes them to another. It performs its duties fine, but it isn't the fastest thing. I've seen other applications that can tear through a gigabyte or more of reads/writes in amazing speeds. Obviously they're operating closer to the metal than a little .NET app. What are the most efficient .NET APIs for streaming to/from the disk? What win32 APIs are

Ruby Get Available Disk Drives

由 半腔热情 提交于 2019-12-07 02:44:20
问题 Can anyone tell me how I can get a list of the available disk drives in ruby? I am creating an open file dialogue and need to know! Thanks in advance, ell. 回答1: The article Brian gave correctly states the following code: require 'win32ole' file_system = WIN32OLE.new("Scripting.FileSystemObject") drives = file_system.Drives drives.each do |drive| puts "Available space: #{drive.AvailableSpace}" puts "Drive letter: #{drive.DriveLetter}" puts "Drive type: #{drive.DriveType}" puts "File system: #

Xcode真机测试could not find developer disk image解决方法

由 怎甘沉沦 提交于 2019-12-06 23:25:07
Xcode真机测试could not find developer disk image解决方法 在使用Xcode进行真机调试的时候，有时根据真机的系统不同，会出现could not find developer disk image 错误，这是由于真机系统过高或者过低，Xcode中没有匹配的配置包文件，我们可以通过这个路径进入配置包的存放目录： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport 里面有类似这样的一些文件夹，如果这些文件夹中没有包含我们真机的系统，则不能进行真机测试。但是我们可以通过将相应的配置包添加入这个文件夹来解决问题： 说了解决的方法，不提供文件，会让大家觉得坑爹，下面给大家一个链接，里面有从iOS4.2到9.1所有版本的配置包，大家各取所需，不用感谢我： http://pan.baidu.com/s/1qYIQWjE。 专注技术，热爱生活，交流技术，也做朋友。 ——珲少 QQ群：203317592 来源： oschina 链接： https://my.oschina.net/u/2340880/blog/521700

five minutes rules - the price of one access of disc I/O

由 ◇◆丶佛笑我妖孽 提交于 2019-12-06 11:29:33
This is very interesting topic , they use following formula to compute access interval time: BreakEvenIntervalinSeconds = (PagesPerMBofRAM / AccessesPerSecondPerDisk) × (PricePerDiskDrive / PricePerMBofRAM). It is derived using formulas for the cost of RAM to hold a page in the buffer pool and the cost of a (fractional) disk to perform I/O every time a page is needed , equating these two costs, and solving the equation for the interval between accesses. so the cost of disc I/O per access is PricePerDiskDrive / AccessesPerSecondPerDisk , My question is why disc I/O cost per access is computed
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