One-page printable guide: DAS vs NAS vs SAN at a glance (access level, live-recording target, scaling), the five RAID levels compared (min disks, usable capacity, failures survived, write penalty, surveillance fit), the two-budget sizing recipe (capacity and sustained write throughput), the surveillance-drive and CMR-not-SMR checklist, the rebuild-danger-window warnings, and a blank per-array sizing worksheet.
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