Hard Disk Sentinel vs Prefail
Hard Disk Sentinel
hdsentinel.com
Prefail
prefail.ioSide by side
| Figure | Hard Disk Sentinel | Prefail |
|---|---|---|
| Price from | Free | $9/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Windows | Yes | — |
| Linux | Yes | Yes |
| API | — | Yes |
| Plans published | 7 | 5 |
| Spec score · Disk Health Monitoring Software | 8.2 (#6) | 7.9 (#14) |
| Integrations | Professional can provide drive status to developers through WMI or XML, while Professional and Enterprise support file transfer by FTP or email. | The product provides Telegram alerts and a Telegram Mini App dashboard, with email alerts as a fallback. |
| Intended users | The maker describes serving home users, server administrators, small and large companies, and civil organizations. | Prefail describes itself as a specialist tool for monitoring disk health across server fleets. |
| Purpose | Hard Disk Sentinel monitors, diagnoses, tests, and reports on hard disk and SSD health, performance degradation, and failures. | Prefail monitors disk S.M.A.R.T. health and sends alerts about disk problems and recommended actions. |
Plans
Hard Disk Sentinel
- DOSFree
- LinuxFree
- TrialFree
- Standard$22, paid once
- Professional$33, paid once
- Professional Family$59, paid once
- Enterprise$219.50, paid once
Prefail
- FREEFree
- PRO$9 a month
- BUSINESS$39 a month
- SCALE$149 a month
- ENTERPRISEPriced on request
In their own words
Hard Disk Sentinel
Hard Disk Sentinel has no write-up on Specifiction yet; its figures are above.
Prefail
Prefail monitors disk S.M.A.R.T. health across server fleets and sends warnings about problems and possible next steps. Its SENTINEL system weighs more than 25 S.M.A.R.T. attributes to assign each disk a risk score from 0 to 100, with history views showing seven-day changes and whether signals are stable or rising. Alerts include severity, an explanation, and a recommended action, and can be acknowledged, muted, or dismissed in batches. Supported RAID setups include MegaRAID 9260/9361/9460, Adaptec SmartRAID, and Linux mdadm, with visibility into disks behind controllers. Prefail offers Telegram alerts and a Telegram Mini App dashboard, with email as a fallback, plus a weekly PDF fleet report. Its Linux agent is a Bash script that runs smartctl and transmits S.M.A.R.T. output. Prefail says it sends data over TLS and stores it on a dedicated European server. The free tier covers up to two servers; paid plans start at $9/mo. The maker warns that S.M.A.R.T. monitoring cannot catch sudden failures and does not replace backups.