SD cards can hold a significant amount of data that can be of relevance in digital investigations. This data can include information such as digital images, videos, documents, and other types of files. The data stored on an SD card can provide important evidence in criminal investigations, civil litigation, and other types of cases. However, it is important to note that the data on an SD card may have been altered or deleted, making it important to use proper forensic techniques to collect, preserve, and analyze the data. Additionally, data on an SD card may be encrypted, requiring the use of specialized software or tools to access the information.

Write blocking devices are used by digital investigators to preserve the integrity of digital evidence during the collection and analysis process. By preventing the write access to a digital storage device, write blocking devices ensure that the original data on the device remains unaltered and intact. This is critical because altering the original data on the device, even unintentionally, can compromise the authenticity and reliability of the evidence.

In a forensic investigation, write blocking devices are used to prevent changes to the data on the original storage device, such as hard drives or flash drives, while allowing read access to the data. This allows investigators to safely make a forensic image of the original storage device, which can then be analyzed without altering the original data.

In summary, write blocking devices are essential tools for digital investigators as they help to maintain the integrity of the digital evidence and prevent any tampering with the original data, ensuring that the evidence remains admissible in court.

Being a digital forensic investigator typically involves the analysis and examination of digital devices and media to uncover and preserve evidence for investigations in criminal, civil or other legal cases. This can involve tasks such as retrieving deleted data, analyzing computer logs, and examining data from smartphones, computers, and other electronic devices. The work requires a strong understanding of computer systems, expertise in data recovery, and knowledge of relevant laws and regulations. The role often requires attention to detail and the ability to work under tight deadlines in a fast-paced environment. It is a challenging but rewarding field that can help to bring justice in many cases.

For a digital forensic investigation, the following elements are typically required:

1. A clear understanding of the incident or crime: The purpose and scope of the investigation should be clearly defined.

2. A digital device or storage medium: This could be a computer, smartphone, tablet, hard drive, memory card, or any other device that contains digital data.

3. Tools for data collection and preservation: To ensure that the data is not altered or destroyed during the investigation, proper tools for data collection and preservation should be used.

4. Tools for data analysis: Software and hardware tools for analyzing digital data, such as forensic software, disk imaging software, and hardware write blockers.

5. Technical expertise: A team with specialized knowledge and experience in digital forensics is critical to conducting a successful investigation.

6. A documented and repeatable process: A documented and repeatable process should be followed to ensure that the investigation is conducted in a systematic, thorough, and impartial manner.

7. A secure environment: The investigation should be conducted in a secure environment to prevent contamination of the evidence.

8. Legal framework: The investigation must be carried out within the framework of the law, including the relevant laws and regulations regarding privacy, data protection, and the admissibility of digital evidence in court.

Digital forensics investigators follow a structured process to investigate digital incidents, which involves the following steps:

1. Identification: They identify the source and scope of the digital incident.

2. Preservation: They preserve and protect the evidence, ensuring that it remains unaltered and authentic.

3. Collection: They collect data from various sources such as computers, mobile devices, cloud storage, etc.

4. Examination: They analyze and examine the data collected to identify relevant evidence, and use various tools and techniques to extract and recover it.

5. Analysis: They analyze the evidence to identify the cause of the incident and the culprits involved.

6. Presentation: They present the findings in a clear and concise manner, either in a report or in court.

Throughout the process, digital forensics investigators ensure that the evidence they collect and the methods they use are admissible in court and comply with legal and ethical standards.