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Pros: I've been using it in my TiVo Premiere XL (model# 748000) for about 6 weeks now after upgrading the stock 1TB drive (157 HD hours) to this giving me total of 640 HD hours. Excellent performance so far. I've added nearly 250 HD hours of recordings since the upgrade and everything is recording and playing back fine.
Gave it 5-stars for the great performance and noiseless operation. I no longer have to worry about the TiVo hard drive filling up often...and I'm recording lots of shows to my heart's content. And of course I no longer have to archive recordings (using kmttg) as frequently - in fact haven't archived anything even once since the upgrade.
I would recommend it to anyone who is willing to go through the very technical process of 4TB TiVo drive DIY upgrade detailed here - go to tivocommunity.com forum and search for 4TB Premiere DIY (showthread.php?t=513785)
The other thing I'd mention is that many people who reviewed this and gave bad feedback are not really applying this drive the way it was intended to be used. The AV in the model name stands for AudioVideo. This drive is primarily intended to be used in AudioVisual equipment like DVRs (like TiVo) and/or security camera storage. Those applications require low-noise, low-heat, non-stop usage. Unlike a regular computer drive where there are built in mechanism in the drive to continuously monitor the accuracy of data-writes, these kinds of continuous writes require the drives to continue writing even if it encounters a bad sector in the drive...those non-stop video writing can't wait for the drive to attempt multiple times to write the same data (which a regular PC drive would do and if it fails then it skips over the bad sector and attempts to write that same data in another drive sector). But these AV applications need to constantly write the streaming data and if it fails writing to a bad sector, it continues writing the rest of the streaming video data not caring whether the write was successful or not. That is by design. In case of unreadable bad sector during playback, software in DVRs like TiVo is written to skip over the unreadable sector and continue playing back the video with a minor hiccup in the video continuity.
Cons: None.READ FULL REVIEW