Data loss prevention

A method for storing data, performed at a computer system comprising one or more processors and memory, the method comprising:

• implementing a packing algorithm configured to store a first set of files in a first file system to create an amount of slack space on a storage medium, wherein the slack space comprises space in the storage medium between the end of a file in the first set of files and the end of a cluster allocated by the first file system to store the file, wherein the cluster is a predetermined minimum amount of contiguous space that can be allocated by the first file system;
• receiving a request to store data on the storage medium;
• and
• in response to receiving the request:
• determining whether to use the first file system or a second file system to store the data, wherein the second file system is configured to store a second set of files in the slack space of the first file system;
• in response to determining to use the second file system, determining, based on an index of the second set of files that are stored in the slack space, a location in the slack space on the storage medium in which to store the data;
• and
• storing the data at the determined location in the slack space.

A non-transitory computer-readable storage medium storing one or more programs configured to be executed by one or more processors of a device with one or more processors and memory, the one or more programs including instructions for:

• implementing a packing algorithm configured to store a first set of files in a first file system to create an amount of slack space on a storage medium, wherein the slack space comprises space in the storage medium between the end of a file in the first set of files and the end of a cluster allocated by the first file system to store the file, wherein the cluster is a predetermined minimum amount of contiguous space that can be allocated by the first file system;
• receiving a request to store data on the storage medium;
• and
• in response to receiving the request:
• determining whether to use the first file system or a second file system to store the data, wherein the second file system is configured to store a second set of files in the slack space of the first file system;
• in response to determining to use the second file system, determining, based on the index of a second set of files that are stored in the slack space, a location in the slack space on the storage medium in which to store the data;
• and
• storing the data at the determined location in the slack space.

A computer system for storing sensitive data in an alternate data stream (ADS), comprising:

• one or more processors;
• and
• memory storing one or more programs configured to be executed by the one or more processors, the one or more programs including instructions for:
• storing sensitive data in an alternate data stream of a file;
• storing non-sensitive data in an unnamed data stream of the file, wherein the non-sensitive data comprises one or more indicators that the non-sensitive data includes sensitive data that is not included in the non-sensitive data.