NoClone - TRUE Duplicate File Finder

NoClone is a powerful file management utility to find out and remove duplicate MP3, duplicate photos or other duplicate files. Besides saving valuable local hard disk space, removing duplicates will also help to manage file well, speed up file indexing.

Why is NoClone a TRUE duplicate file finder?

By True Byte-to-Byte Comparison ,NoClone finds out the TURE duplicate files which are exactly the same in content, instead of FALSE duplicate files.

Why is CRC or MD5 not reliable?

Comparing file content by CRC or MD5 is a common practice of uncovering duplicate files. However the collision rate of CRC is not satisfactory and some research indicated that there is a possibility of collision even for MD5 hashing. Here is an example from http://www.mscs.dal.ca/~selinger/md5collision/:

Here are two files with same MD5 hash value (cdc47d670159eef60916ca03a9d4a007)*,which are judged as duplicate files by MD5 comparison.

Windows version: Hello.exe erase.exe

Run them and you will find they got different output as follows:

Therefore, by CRC or MD5 comparison, it can’t be a TRUE duplicate file finder. Comparing exact content is the only way to ensure 100% duplicates and NoClone has realized that.

How does True Byte-by-Byte comparison work? Still efficient!

Some may argue that by Byte-to-Byte comparison, comparing file is slow and inefficient. However NoClone, a true duplicate file finder, optimized it to an efficient algorithm.

NoClone filters suspected duplicate file with same file size and type, from which blocks of data is read and compared. Duplicate file is matched with all blocks. With the above comparison algorithm, each file is opened once for comparison, which works as MD5 hash comparison.

NoClone - duplicate file finder Vs Windows XP duplicate finder

	NoClone - Duplicate File Finder	Windows XP duplicate finder
Comparison	True byte-by-byte comparison: no false duplicates; accurate	CRC32 hash function: may result in false duplicate files; inaccurate
Similar files	Specify similarity
Mp3 tags
Definition of duplicate files	Flexible definition: Contents File name Date Size etc	Same file name and/or CRC32 only
Search criteria	Flexible search criteria: Sub-folders File types Multiple folders Search against master folders	Single folder Sub-folder only
Protect system folders	Exclude Windows and Program files folders
Duplicate Outlook emails
Mark duplicates	Time-saving Smart marker Mark all except one	Time-consuming: Select one file at a time
Deduplication options	By Batch Delete permanently Delete to recycle bin Move Replace by shortcut Replace by NTFS hard link Copy	On single file only Delete Move Copy
Scalability	Scan more than 1 million files	May fail on large scan
Housekeeping	Export result to CSV, Excel, XML; save search session	Export to text file only
Windows Vista /7	Works with Vista / 7	?

Save money

There is no need to buy a new hard drive. Just bring it home, only US$29.9 for Home Edition and US$79.9 for Enterprise Edition.

Try NoClone -duplicate file finder. Free download

Buy / upgrade NoClone - duplicate file finder
US$29.90 only!

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5/17/2010 10:22:29 AM modified.