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Data corruption can occur when attempting to change a segment of a link in an Excel file if any of the following happens:

1. The link is broken or corrupted: If the link that you are trying to change is already broken or corrupted, attempting to change it may result in data corruption. This can happen if the linked file has been moved or deleted, or if the link was created incorrectly in the first place.

2. Incorrect formatting: When attempting to change a segment of a link in Excel, it is important to ensure that the formatting is correct. If the formatting is incorrect or not consistent with the rest of the document, it can lead to data corruption.

3. Editing the wrong cell: Data corruption can also occur when attempting to change a segment of a link if you accidentally edit the wrong cell. This can cause the linked data to become disconnected, resulting in corruption.

4. Multiple users accessing the file: If multiple users are accessing the same Excel file and making changes simultaneously, it can lead to data corruption. This is because each user may be making changes to different parts of the file, and these changes may not be compatible with each other.

5. Software or hardware issues: Data corruption can also occur due to software or hardware issues such as viruses, malware, or hardware failures. These types of issues can affect the entire Excel file, including the linked data segments.