How many bad blocks does my drive have? DA ULINK August 10, 2021 22:02 For SATA drives, the number of bad blocks may be captured by the Number of Reallocated Logical Sectors or SMART Attribute 5. For SCSI drives, the number of bad blocks may be captured by No of Growing Defects. Related articles Does DA Drive Analyzer display drive health information in real time? Main Registered Users and Viewers (QNAP Customers) Will AI Predictions be affected if my drive doesn't upload health-data for a day or two? Comments 0 comments Please sign in to leave a comment.