![]() To determine whether this is the optimal cluster size, you must determine the wasted space on your disk. You can use this information to determine how your disk space is being used and the default cluster size. Multiply each value that the output reports in kilobytes (KB) by 1024 to determine accurate byte counts. <- Total Clusters on disk.Ģ83615 allocation units available on disk. (4K)ġ024135 total allocation units on disk. <- Available FREE disk spaceĤ096 bytes in each allocation unit. <- NTFS Log file - (Can be adjusted using chkdsk /L:size)ġ134460 KB available on disk. <- Includes MFT and other NTFS metafiles.Ģ2544 KB occupied by the log file. <- Space lost to bad sectors.Ĥ9379 KB in use by the system. <- Space used by NTFS indexes.Ġ KB in bad sectors. <- Space used by user file data.Ħ344 KB in 1301 indexes. <- Total formatted disk capacity.Ģ906360 KB in 19901 files. Where d: is the letter of the drive that you want to check.Ĥ096543 KB total disk space. To do so, follow these steps:Ĭlick Start, click Run, type cmd, and then click OK.Īt the command prompt, type the command: chkdsk d. To determine the current cluster size and volume statistics, run a read-only chkdsk command from a command prompt. ![]() When data is later added to a file, NTFS increases the file's allocation in multiples of the cluster size. When a file is created, it consumes a minimum of a single cluster of disk space, depending on the initial file size. The cluster size is determined by the partition size when the volume is formatted.įor more information about clusters, see Default cluster size for NTFS, FAT, and exFAT. A cluster is a collection of contiguous sectors. These files and folders consume all the file space allocations by using multiples of a cluster. Only files and folders that include internal NTFS metafiles like the Master File Table (MFT), folder indexes, and others can consume disk space. The following information can help you to optimize, repair, or gain a better understanding of how your NTFS volumes use disk space. Other NTFS features may cause file-allocation confusion.NTFS corruption causes free space to be reported as in use.Files or folders contain alternate data streams.NTFS metafiles (such as the Master File Table) have grown, and you cannot de-allocate them.Folders or files contain invalid or reserved file names.The folder path exceeds 255 characters. ![]()
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