Anyone know the write speeds of this device?

I have the 128GB version. The sustained sequential write speed is approx 28MB/s

Will this work with a sony bravia kd-55ag9 oled tv?

I have the 64gb version of this plugged into my sony bravia 55 for recording and it works great.

sandisk have a reputation for going 'read only' (this has happened to me). Is this also prone to that ??

Mine didn’t go read only, but was completely undetected after a few months of use.

The blurb says it includes sandisk secureaccess password protection. if i format the drive to ntfc will the password protection software be lost?

Yes I am sure it will. It did for me. Formatting wipes the slate clean. You could perhaps copy the software before formatting and then reload afterwords. Not sure if that would work, but I think it would.

Colour	Silver
Special feature	Lightweight
Read speed	4E+2 Megabytes Per Second
Item weight	20 Grams
Warranty type	Limited
Write speed	150
Hardware interface	USB 3.2 Gen 1
Product dimensions	5.2L x 1.3W centimetres
Manufacturer	SanDisk
UPC	619659179427
Item model number	SDCZ74-512G-G46
Are Batteries Included	No
Lithium Battery Weight	2.5 Grams
Item Weight	20 g
Guaranteed software updates until	unknown

Ultra Luxe Type A Flash Drive, 512GB USB stick, Memory stick USB 3.2 Gen 1 + USB 3.0 capable up to 400 MB/s read speeds, Password protection, USB 3.2 Gen 1 Silver

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