Actually, there is a difference. The SA DVRs won't work with an eSATA enclosure that supports "auto-sensing" or that goes into a power-save mode. Most external enclosures don't do auto-sensing, but some do, like every WD enclosure except the one marked for DVRs. Enclosures that support that go into power-save mode will initially work, but everytime it goes into that mode you have to pull the power cord on the DVR to get it to work correctly. Unfortunately I have experience with this.
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Actually, there is a difference. The SA DVRs won't work with an eSATA enclosure that supports "auto-sensing" or that goes into a power-save mode. Most external enclosures don't do auto-sensing, but some do, like every WD enclosure except the one marked for DVRs. Enclosures that support that go into power-save mode will initially work, but everytime it goes into that mode you have to pull the power cord on the DVR to get it to work correctly. Unfortunately I have experience with this.