re qwertl:
I don't know what medium you used to enter DOS. I think you can definitely use a USB flash drive or a CD to enter DOS, and then use DOS tools: pqmagic or diskgen to check if there is a hard disk.
But there is one thing to remind you. If you bought a new notebook, its partition format may have problems (now manufacturers process the partition table to achieve one-key restore, which is not very strict. Even after entering pqmagic, it prompts that there are errors in the partition, which is completely possible. I have seen many new notebooks have this problem, including mine, but XP and Vista consider this normal).
Therefore, the possible reasons why you can't find the hard disk are as follows:
1. The partition structure of the hard disk is problematic. It is recommended to back up data, use pqmagic or diskgen to force re-partition, or use Linux to partition. The partition structure they generate is very traditional and strict.
2. All partitions of a newly purchased notebook are in NTFS format (one large C drive), so it is normal that the hard disk drive letter cannot be found in the DOS command line mode. It is recommended to use other tools to view the hard disk structure.
3. Whether the hard disk setting in BIOS can change the SATA-related mode to compatibility mode or IDE mode.
I hope you can describe the detailed situation of the problem, such as the DOS system used, the boot medium, the added drivers, the viewing tool, the prompt content when the problem occurs, etc., so that everyone can give more targeted suggestions.