IDE is a bit of a misnomer, but yes, it is an IDE drive. The correct term for the connection is Parallel ATA, or PATA.
If you'd just like to access the data, an IDE to USB is your best bet. IDE to SATA does exist, but i wouldn't use it in a modern rig, not only that but it wouldn't work in AHCI mode, so it for sure shouldn't be used as a boot drive.