USB Mass Storage Floppy Drive

I am trying to implement a USB Floppy drive, I have been trying to find out exactly how windows differentiates a floppy drive from a removable drive without sucess. Is it the medium size? do i need to implement a READ_FORMAT_CAPACITIES is it the MODE_SENSE??? I have been searching the net for a month and found nothing at all on this subject. I have started with the Microchip Solutions Mass Storage example and would like to stick with bulk only transfer if I can, I have no problems adding some of the UFI command if I have to.

UFI was what floppies used

Exactly.

Descriptor read out from a USB floppy drive
[font="'courier new'"]

[font="'courier new'"]    Device Descriptor   
[font="'courier new'"]        Descriptor Version Number:   0x0110
[font="'courier new'"]        Device Class:   0   (Composite)
[font="'courier new'"]        Device Subclass:   0
[font="'courier new'"]        Device Protocol:   0
[font="'courier new'"]        Device MaxPacketSize:   64
[font="'courier new'"]        Device VendorID/ProductID:   0x0409/0x0040   (NEC Corporation)
[font="'courier new'"]        Device Version Number:   0x0123
[font="'courier new'"]        Number of Configurations:   1
[font="'courier new'"]        Manufacturer String:   1 "NEC"
[font="'courier new'"]        Product String:   2 "NEC USB UF000x"
[font="'courier new'"]        Serial Number String:   0 (none)
[font="'courier new'"]    Configuration Descriptor (current config)   
[font="'courier new'"]        Length (and contents):   39
[font="'courier new'"]        Number of Interfaces:   1
[font="'courier new'"]        Configuration Value:   1
[font="'courier new'"]        Attributes:   0x80 (bus-powered)
[font="'courier new'"]        MaxPower:   500 ma
[font="'courier new'"]        Interface #0 - Mass Storage/UFI   
[font="'courier new'"]            Alternate Setting   0
[font="'courier new'"]            Number of Endpoints   3
[font="'courier new'"]            Interface Class:   8   (Mass Storage)
[font="'courier new'"]            Interface Subclass;   4   (UFI)
[font="'courier new'"]            Interface Protocol:   0
[font="'courier new'"]            Endpoint 0x82 - Bulk Input   
[font="'courier new'"]                Address:   0x82  (IN)
[font="'courier new'"]                Attributes:   0x02  (Bulk no synchronization data endpoint)
[font="'courier new'"]                Max Packet Size:   64
[font="'courier new'"]                Polling Interval:   0 ms
[font="'courier new'"]            Endpoint 0x01 - Bulk Output   
[font="'courier new'"]                Address:   0x01  (OUT)
[font="'courier new'"]                Attributes:   0x02  (Bulk no synchronization data endpoint)
[font="'courier new'"]                Max Packet Size:   64
[font="'courier new'"]                Polling Interval:   0 ms
[font="'courier new'"]            Endpoint 0x83 - Interrupt Input   
[font="'courier new'"]                Address:   0x83  (IN)
[font="'courier new'"]                Attributes:   0x03  (Interrupt no synchronization data endpoint)
[font="'courier new'"]                Max Packet Size:   2
[font="'courier new'"]                Polling Interval:   127 ms
[font="'courier new'"]

Tsuneo

I had posted the same question on a Microsoft forum and I have an answer, I have tested it and it is working! :) Use subclass 6. Device response to INQUIRY command, DeviceType field value must be 0x0 (DIRECT_ACCESS_DEVICE). Device response to READ FORMATTED CAPACITY, number of blocks and block length fields must match with one of these. Blocks BlockLen Capacity 0x00000500, 0x000200 // 640 KB 0x000005A0, 0x000200 // 720 KB 0x00000960, 0x000200 // 1.20 MB 0x000004D0, 0x000400 // 1.23 MB 0x00000B40, 0x000200 // 1.44 MB 0x0003C300, 0x000200 // 120 MB 0x000600A4, 0x000200 // 200 MB This ensures the floppy compatible ID is generated for the enumerated LUN device object.