Actually, HDD would boot from any drive the BIOS can boot from, even USB or FireWire. Once it boots, it walks the available drives looking for a valid configuration. In fact, some people have installed NASLite-2 HDD on IDE or SATA drives and then move them to USB or FW enclosures for periodic use as mirror drives, etc. There really is no restriction which drive the OS is installed to.
However, the partitioning of the drives is critical. All data partitions are #1 or the first partition in a drive. NASLite-2 HDD is installed on partition #2 which is located low on the drive and resides before data partition #1. That way older BIOS can sometime be fooled into booting HDD from a normally unsupported larger drive.
Anyway, just some facts about NASLite-2 HDD
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