Autorun An Html File From Usb Pen Drive' title='Autorun An Html File From Usb Pen Drive' />USBDLM is a Windows service that gives control over Windows drive letter assignment. Initially made for USB drives it can now control drive letters of other drive. Youve got problems, Ive got advice. This advice isnt sugarcoatedin fact, its sugarfree, and may even be a little bitter. Welcome to Tough Love. Tips for USB pen drives. Under Windows XP writing of lots of small files to a Removable pen drive is extremely slow, while its fast under Windows 2. Writing large files there is no appreciable difference. Obviously Windows XP doesnt enable a write cache for USB drives that appear as Removable. View and Download Biostar G31M7G DVI setup manual online. Setup Manual. G31M7G DVI Motherboard pdf manual download. The option Enable write caching on the disk is grayed out for USB drive this mean the hardware cache of the drive and the removal policy setting Optimize for quick removal or Optimize for performance doesnt seem to make any difference, except that the latter enables the user to format Removable USB drives with NTFS. But with NTFS Windows XP enables a write cache, writing small files becomes lightning fast. Update Feb 2. 01. I was pointed to the fact that by means of the registry value Write. Cache. Enable. Override a write cache can be forced for any USB drive, even FAT formatted removeable drives. XXurK-N8/SwnmCu-wXkI/AAAAAAAAAac/eFm8z6i0av8/s1600/USB.JPG' alt='Autorun An Html File From Usb Pen Drive' title='Autorun An Html File From Usb Pen Drive' />And it indeed works I have made a litte tool USB Write. Cache. So, NTFS is not essential for having a write cache. Use NTFS anyway for USB flash drives Advantages Write cache on all computers. NTFS stores small files together with the directory entry, this safes write accesses. NTFS supports file compression, this safes write accesses too for compressible files only. FATFAT3. 2 becomes linear slower with the number of files in folder, NTFS does not. FATFAT3. 2 is limited to 6. NTFS supports files 4. GB. But actually NTFS isnt suitable for flash medias because as journalling file system it has some overhead that wears out flash memory. But Windows XP optimizes and bundles write accesses to pen drives only when they are NTFS formatted, so I see NTFS as the right choice. Furthermore NTFS stores small files together with the file information so they are written into the same flash block which is the best that can happen. A drawback with NTFS and flash medias is that NTFS saves the access time when you read a file, so a simple read access causes flash wear out. In fact it is not as dramatically because Windows writes the data not immediately onto the media. It does it when it has to update something else there, when one hour is over on when a media is unmounted. Actually Ive never seen XP writing a last access time to a USB drive. The last access time is also updated on directory listing whatever this means. This can be disabled, unfortunately for all drives only Create a new DWord value under HKEYLOCALMACHINESYSTEMCurrent. Control. SetControlFile. System called. Ntfs. Disable. Last. Access. Update and set it to 1. Or download the following REG file and doubleclick it Ntfs. Disable. Last. Access. Update. 1. reg. Since Vista this can be configured more detailed. Ntfs. Disable. Last. Access. Update at Microsoft. To format a pen drive with NTFS there is no need to switch to optimize for speed. Using the commandline tool CONVERT you can convert a FAT formatted drive to NTFS. Sample. convert u fs ntfs. But XPs CONVERT creates a NTFS with a cluster size of 5. Bytes if the FAT clusters are not 4. K aligned. If the drive is FAT formatted under XP, then the clusers are 4. K aligned and XPs CONVERT works fine. W2. Ks CONVERT seems to creates 5. Bytes clusters in any case. Using the Windows format dialog you can choose 4. Bytes is the defaut. With a cluster size above 4. Bytes file compression and encryption become unavailable. Of course a NTFS formatted drive doesnt work under Windows 9. ME. Furthermore devices with a standalone functionality as MP3 players or image tanks may not work with NTFS. If both, format and convert fail while formatting with FATFAT3. The NTFS file system is written into the middle of the drive while the FAT is written to at the begin of the drive. So, if the drive is a simple fake then the NTFS file system is written into non existent memory. Newer fake drives are made more clever, the first write accesses go to existing memory, so formatting with NTFS does not fail. But as soon as more data then really build in is wriiten in sum, the problems begin. The effect of having a write cache or not depends on the USB drive Hard drives have an 2. MB of cache RAM which prevents to much performance impact. Most USB flash have no such cache, so their access times are very important for their real live speed. By means of HD Tune you can check the read access times. Here a screenshot of the bad example Corsair Flash Voyager 2. GB have a look at the yellow dots above the diagram. Its from 2. 00. 5, the current exemplars are better. To test the file cache behaviour Ive made File. Cache. Test. It can read and write a test file using different flags for the API function Create. File and using different block sizes. Remember the difference between writing a file for the first time and to an existing file Writing the first time, the file size has to be adjusted after each block. The most remarkable effects under XP are. FAT formatted removable USB drives. FAT formatted removable USB drives using a block size below 4. Bytes is cached, others are not for NTFS drives the magic block size is about 5. KB, under Windows 7 3. MB. using flag FILEFLAGRANDOMACCESS causes a blows up of the file caches working setusing flag FILEFLAGNOBUFFERING is the most efficient way to read and write large files but leads to fragmentation if the target file is compressed. USB drives the removal policies Optimize for speed and Optimize for quick removal have absolutely no effect on the caches behaviour. Deactivate write cache. There is no known way to deactivate a write cache if Windows decided to activate it, e. NTFS formatted drives there is always a write cache. On a FAT formatted drive a solution could be to turn a drive into a removable drive by setting the removable media bit RMB by means of a filter driver like the Hitachi filter drive but for the opposite purpose. Install Cracked Ipa Iphone Cydia.