Recovering data from Sandisk hard drives

SanDisk Ultra II (240gb) bought late in 2015 has stopped working. Desktop hard drive indicator stays on and the machine will not boot. Have tried connecting externally, with a working USB bridge to another computer – the device is not detected. I will be returning the device under warranty to SanDisk. Please can you contact me with some data recovery options?

My iPhone (5s) have had overloaded memory and stopped working. I could see only Apple icon all the time. So, there was a system update. And now I have photos only from iCloud (about 300). My 7000 photos disappeared. I tried to recover it using recovery programs with no result. I also called local repair services. Phone has no value for me right now. I can let someone take it to pieces but I must have these images. I had the images saved to a sandisk hard drive and wonder if you can extract the file from that?

Its a Sandisk ultra hdd that I’ve made into a portable drive.
When you plug the external hard drive in it doesnt show up on my computer but showes up on the bit where you can disconnect the hard drive, Also shows up on the disk management but says it is unallocated. I did a disk defragmentation on my computer but didnt realise my external hard drive was plugged it, That was the last time my hard drive actually worked but not sure if thats the reason its not working. Also when you plug it in the light doesnt come on anymore but does make noise to show its registered on the computer and makes the external hard drives makes a noise like its running. i spoke to sandisk about it but they dont seem willing to do the data recovery work.