One Article Review
| Source |  AlienVault Lab Blog |
|---|---|
| Identifiant | 8482607 |
| Date de publication | 2024-04-15 10:00:00 (vue: 2024-04-15 10:07:10) |
| Titre | Le cycle de vie d'un fichier numérique The Lifecycle of a Digital File |
| Texte | The content of this post is solely the responsibility of the author. AT&T does not adopt or endorse any of the views, positions, or information provided by the author in this article. In the digital world, every document, image, video, or program we create leaves a trail. Understanding the lifecycle of a file, from its creation to deletion, is crucial for various purposes, including data security, data recovery, and digital forensics. This article delves into the journey a file takes within a storage device, explaining its creation, storage, access, and potential deletion phases. File Lifecycle 1. Creation: Birth of a Digital Entity A file\'s life begins with its creation. This can happen in various ways: Software Applications: When you create a new document in a word processor, edit an image in a photo editing software, or record a video, the application allocates space on the storage device and writes the data associated with the file. Downloads: Downloading a file from the internet involves copying data from the remote server to your storage device. Data Transfers: Copying a file from one location to another on the same device or transferring it to a different device creates a new instance of the file. System Processes: Operating systems and applications sometimes create temporary files during various processes. These files may be automatically deleted upon task completion. During creation, the operating system assigns a unique identifier (often a filename) to the file and stores it in a directory (folder) along with additional information about the file, known as metadata. This metadata typically includes: File size: The total amount of storage space occupied by the file. Creation date and time: The timestamp of when the file was first created. Modification date and time: The timestamp of the last time the file content was modified. File access permissions: Restrictions on who can read, write, or execute the file. File type: Information about the type of file (e.g., .docx, .jpg, .exe). 2. Storage: Finding a Home Storage devices like hard disk drives (HDDs), solid-state drives (SSDs), and flash drives hold the data associated with files. However, the data isn\'t stored as a continuous stream of information. Instead, it\'s broken down into smaller chunks called sectors. When a file is created, the operating system allocates a specific number of sectors on the storage device to hold the file content. This allocation process can happen in various ways depending on the file system used. Here are some key points to remember about file storage: Fragmentation: Over time, as files are created, deleted, and resized, the available sectors become fragmented across the storage device. This fragmentation can impact file access speed. File Allocation Table (FAT) or Similar Structures: Some file systems rely on a separate table (FAT) or index that keeps track of which sectors belong to specific files. Deleted Files: When a file is deleted, the operating system typically only removes the reference to the file from the directory structure. The actual data may still reside on the storage device until overwritten by new data. 3. Access: Reading and Writing We interact with files by accessing them for various purposes, such as reading a document, editing an image, or running a program. This involves the following steps: File System Request: When an application attempts to access a file, it sends a request to the operating system. Directory Lookup: The opera |
| Envoyé | Oui |
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