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The HP 9114 and the Media Monitor - Dave Frederickson - Yesterday 07:19 PM
Does the 9114 support Media Monitor? According to Measurement Computation News, it does.
https://www.hpmuseum.net/pdf/Measurement-Computation-News_1984_Sep-Oct_13pages_OCR.pdf
The Media Monitor is a feature of many HP disc drives that monitors floppy disc wear and alerts the user if the limit is exceeded. See the 9121 manual for a description. Under the hood, the 9121 stores wear data at Sector 17 of Track 0, Side 0. The sector is 128 bytes long instead of 256.
I don't know what system formats 9121 discs with 17-sector tracks. I think it's the 150 since a number of HP150 discs in the Computer Museum's collection have 17 sectors/track.
What if I format a disc single-sided in a 9114? The 9114 can't format 128-byte sectors so if the 9114 indeed supports the Media Monitor, where is the data stored?
Has anybody seen a 9114 floppy fail due to the Media Monitor?
Update: The 9114 formats single-sided discs with Sector 17 formatted to 128 bytes. One difference is that the 9114 formats the discs to LIF version 1 whereas the 9121 formats the discs to LIF version 0. LIF version 1 discs store the creation date and disc structure.