Standard hard drives are built using PMR, or perpendicular recording. There’s a significant performance penalty for doing so, and that’s not the only issue with SMR drives. Writing data to an SMR drive requires that the drive scan multiple tracks at once and then rewrite them. The problem with SMR drives is that when you overlap the tracks like this, it means that there’s no way to write to just a single track without affecting the data on nearby tracks. Please check the primary source for references in the last column. Credits go to the user Yorick who had compiled the list. Crystaldiskinfo test speed read wirte full#I've seen this with old drives having entire drive full and just 4-5GB free space remaining and if you copy to it you will still get close to 40-50MBps speeds. They give about the same copy speeds whether the drive is empty or full. Lastly, look at the old PMR drives we have at home. Or the entire drive should suffer from low copy and read speeds. There should be no low copy or read speeds throughout the entire drive since the drive hardware chip does all the read write buffering etc. Then the drive should give the same copy and write speeds throughout the entire drive since it's a hardware feature. Let's say the entire platter is an SMR drive. Rest of the space, I got 60-70MBps speeds for both copy paste. So I'm guessing probably around each platter end points. I've seen the copy and read speeds go down to those KB speeds when the drive was around 1 or 1.5TB (happened like a year back and I thought the drive was bad) & 3.5TB filled up. Take your own conclusions from the following. You get the same 3.6TB space for same price while they save money. Instead of using 4 platters for a 4TB drive, they are using 3 platters with a 20% disk space increase per platter using SMR tech. This is what I think the drive manufacturers are doing. Probably each disk has SMR on it throughout the entire platter or it may be confined to some region so that people don't send the drives back after doing a test in crystaldiskinfo thinking the drive is DOA and not giving the claimed SATA 6 speeds. I came to that conclusion after getting varied speeds throughout the drive. This is just my unverified unsubstantiated claim. And most of them don't come with the SMART installed on them so people cannot make out if the drive is bad etc. Drives look like they died but they are not. Crystaldiskinfo test speed read wirte torrent#All the random writes would fill the buffer and make the torrent program think there was some problem with I/O and it would go into paused status.Įven copying to another hdd would be dead slow read speeds with these drives. I was seeing problem with qbittorrent stop downloading data to that drive after some time. Crystaldiskinfo test speed read wirte portable#WIn my case it was problem with 4TB WD portable hdd. And looks like all hdd manufacturers are doing this. Most of the 4TB+ hdd's sold on Amazon india by both Seagate and WD are such crap drives. In my case it falls down to <500KBps after the buffer on the drive fills up and it starts lagging in writing to the disk. These are supposedly new tech that double the data density on hdd platter. Don't know if people here know about SMR hard drives.
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