Looking for release dates of Apple external hard drive and Tape Backup 40SC

Does anyone know the release date of these two SCSI drives? If you can ballpark it that would help, but please indicate how certain you are.
1. "Apple External Hard Drive", 730MB
Image: http://www.bigkey.com/pic/apple/drives/apple2_gig_external_harddisk.jpg
2. Apple "Tape Backup 40SC"
Image: http://www.borkware.com/rants/stuc-on-you/AppleTapeBackup2.jpg

Re: the Hard Drive.
I have an Apple brochure dated Feb 1989 that offers the Apple hard Drives: 20SC, 40SC, 80SC, and 160SC \[and that's all].
My recollection of the drive you pictured is that it was mildly scandalous because they were not even made by Apple -- they were made by a prominent (in those days) drive reseller with the Apple logo on them.
RE: the tape drive
I bought my first Mac, a Mac II, in late 1987. Apple Unix was soon offered for it, but there was no practical way to issue the software except to buy a Hard Drive 80 with Apple Unix pre-installed. The tape backup unit pictured was available some time later, but was far too expensive to use for issuing software.

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