Embodiments of the present disclosure relate to a method, equipment, and a computer program product for detecting incomplete writing of data. The method includes obtaining metadata associated with sectors in a check disk in a redundant array of independent disks (RAID), wherein the metadata includes at least a sequence flag that varies with a write operation on a stripe to which the sector belongsand a partial write flag that indicates whether the stripe is partially written. The method further includes determining whether incomplete writing of data is present in the RAID based on the metadata, and reconstructing at least one disk in the RAID in response to determining that incomplete writing of data is present in the RAID. According to the embodiment of the invention, the incomplete write-in of the data can be more accurately detected by adding the sequence mark and the partial write-in mark in the metadata of the sector of the RAID, so that the reliability of the RAID is improved.