The higher draw is a concern. The power supplies are old now and while they had head room, it wasn't much brand new. That will be less now. Also the higher current will generate more heat.
If you can't find a small lower current draw drive.. you might think going with a Marvell ide to sata adapter and then a $19 for 120 GB M.2 sata SSD with an aluminum bracket to mount the M.2 on first a 2.5
and then 2.5 to 3.5 converter
so you end up with a brand new laptop M.2 SSD to replace the HDD.
The TLC NAND chips would need to be "sata" not "NVM pci express" but the smallest you'll be able to find will be 120 GB
An old laptop sata 2.5 SSD or new 2.5 IDE can still be bought off Amazon but then you would need to adapt that with a cable or mounting adapter.. better to move up in technology to something from 2016 than something from 2009. Also M.2 is easier to find than smaller SSDs these days most SSD start at 1000 GB or 1 TB minimum. They just don't make them that small anymore.
Wear leveling is handled on the M.2 itself these days so there would be no TRIM concerns.
You should get 3 years minimum use out of the SSD. But as long as 8 years since the usage pattern will be different from a normal laptop use to chatty web browser traffic. More likely 8 years except where TVGuide data were concerned. But there is no TVGuide data signal left to use the drive.
Unlike a typical laptop hard drive, the SSD only wears when written to, with a fresh new recording, reads are non destructive.. timeshifting being what it is.. most playbacks will be wear free. So SSD for a DVR makes perfect sense.
I put a M.2 sata SSD in a Pioneer DVR-810H Tivo just this week to replace a Maxtor 3.5 IDE drive, not for speed but because I could not reliably find a new drive from that era that didn't have multiple SMART errors predicting failure. It worked fine.
It will be interesting to check up on its usage pattern over the next year.. but starting out the internal wear clock specified failure in 2028. Nineteen dollars over 8 years for a brand like Kingston.. not bad.
Bonus is two fold. First the adapter and bracket only need to be bought one time. Second the spring loaded chip drive form factor can be used to eject the drive and put in a PC to copy recordings off using Isobuster 4.5
Thin LPC ribbon cables which can bring the four wire sata connection outside the case by wiggling between the cover and the chassis are also very easy if you prefer a super slim external bracket to access the chip drive. Its not like the old days when you had to use big bulky HDD docks. Then either the spring loaded M.2 chip can be used to quickly eject the drive.. or a 2.5 laptop drive carrier can be used to make it more of a thin hand hold grab form factor.. there is such a thing as "too small" an HDD replacement.. at 18 mm tall, the whole thing could fit very close to the top or bottom of the outside of the case.
By the way, those 2.5 to 3.5 converter brackets come in anodized black and silver aircraft aluminum (very structurally stiff). They can easily be matched to the color of the case.
I would caution you that the drive needs to be cloned from the old one to retain the boot up firmware on the original drive. Or you'll need to do the FW CDROM dance to brand a copy of it on to the new drive. Since DVD burners can fail or get dirty and balk at helping you do the FW dance.. cloning is more certain.
Time marches on, but stands still for these machines... they are "Timeless"
Icydock makes a "tool less" m.2 to 2.5 adapter
which is the one I used a couple days ago, its spring loaded as well but doesn't require a screw to hold the m.2 down in the adapter (the old school traditional method). It simply clicks into place with a satisfying snap when you press it down with your thumb. A flick of your finger nail releases it and it "pops up" like Dracula from a coffin.
This "tool less" version is made of plastic mostly and has a surrounding plastic "vent cage" to both protect and cool the m.2 SSD. It might be more appropriate when mounting the frame to the outside of the case. The whole thing can be bolted to the 2.5 to 3.5 converter or left plugged into the larger frame.. so you could jerk the whole m.2 protective case out with a simple pulling motion, or flip the plastic top up and eject the m.2 chip.
The difference is using the sata connector or a B+M slot when connecting to a PC. People have their druthers and comfort level with technology. An older person might prefer a sata connection in a mobile push/pull slot. A younger person something they can stick in a m.2 USB 3.0 adapter
I find people get defensive depending on which tech generation they grew up with, so why not be prepared for both?
All these options hover around ten dollars each.. which makes choosing one difficult, its generally based on convenience and not cost.
The USB 3.0 option would make it easy to attach to a laptop running Isobuster to extract recordings however.. no desktop form factor or chunky USB external drive enclosure to hang the sata carrier off the laptop. Much more portable especially for field work.. say sitting in a grove with your DVR watching a SpaceX liftoff and return.. lol. These DVRs have literally days worth of recording capacity.
.. speaking of Liftoffs..
Using m.2 will also be a significant weight reduction to the recorders heft.