Windows 10: SSD and all USB drives LEDs constantly flashing.

This seems to be an old problem with no clear resolution. With my PC booted but not logged on my SSD (C: drive) and two USB connected drives have their activity LEDs constantly flashing - it appears, in time with the system timer ie a regular flash about every 1 second. The only drive that is not affected in this way is a USB drive connected to the USB port on my BT Home Hub. Trying to track it down with Process Explorer but so far no luck. Problem exists whether I'm logged on or not. Anyone got any thoughts?
TIA
PC is
MoBo:ASUSTeK COMPUTER INC. Z170-P Rev X.0x
UEFI: American Megatrends Inc. 0705 02/23/2016
CPU: Intel i3-6320 @3.9GHz
16 GB RAM
Windows 10 Pro 1803 (17134.285) (Genuine)
Belarc reports the following for the drives:

BIWIN SSD [Hard drive] (256.06 GB) -- drive 0, s/n 161607901029, rev O1026A, SMART Status: Healthy
Maxtor 3200 USB Device [Hard drive] (500.11 GB) -- drive 3, s/n 2CAHGJTJ
Seagate Expansion Desk SCSI Disk Device (2000.39 GB) -- drive 2, s/n NA4KRZ2X
TOSHIBA DT01ACA100 [Hard drive] (1000.20 GB) -- drive 1, s/n Z5G5D5VNS, rev MS2OA750, SMART Status: Healthy
and this excludes the USB drive connected to the HomeHub
Board: ASUSTeK COMPUTER INC. Z170-P Rev X.0x
Serial Number: 160265951800267
Bus Clock: 100 megahertz
UEFI: American Megatrends Inc. 0705 02/23/2016

:)

 

Flash drive

Yeah, suggest a racebike when someone ask for a bicycle. Just... no. USB flash drive means USB flash drive.

 

USB Flash drive made bootable

Hi Nelson,

Check if there is any slide switch on the side that provides write protection. It show's a closed and open lock on each side. We suggest to follow these steps below:

• Insert the USB flash drive into the USB port.
• Click Start, type devmgmt.msc in the Search textbox and press Enter.
• Find Disk Drives and expand it.
• Find the USB flash drive you want to format, and double-click it. It opens the
  Properties dialog box.
• Click Policies tab.
• By default, the Optimize for quick removal option selected, switch it to Optimize for performance and then press
  OK.
• Now open Computer. Right click on the USB Flash Drive and select Format. The Format dialog box now appears.
• Select NTFS in the File System field.
• Press Start and wait while the process will be completed.

You can also connect the USB drive on a different computer and try formatting.

Let us know how it goes.

 

Kingston Digital Launches its Fastest USB Flash Drive

Kingston US lists the 64GB model for $193 and the 128GB model for $377... *Oh Well hwell:
Considering their 120GB HyperX SSD is only $273, it'd be cheaper to get that with a USB 3.0 enclosure than their 128GB flash drive... sure, it's bigger, but so what...