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After a quick search I found that through a command prompt I can convert a drive from FAT32 to NTFS without losing data(see here). What I want to ask here is, how safe is this method on a 1.5 TB drive with 500 GB of data?

What are the chances of this freezing up(or is there really nothin to worry about) and what is the probable time, a couple of minutes or a whole hour?

Sorry if this seems like a stupid question, just want to play on the safe side here ...

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closed as primarily opinion-based by Scott, DavidPostill, MariusMatutiae, mdpc, Nifle Jun 18 '15 at 17:24

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 9 down vote accepted

There's always risk. Microsoft advises you to backup your data before doing this and it's a good suggestion. However, I've converted dozens of drives and never had a problem. Not to say YOU won't run into one, but it's pretty safe - barring a power outage or similar catastrophic event.

Time I can't estimate precisely, but as a SWAG I'd give it a few hours for a drive that size.

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Same here, have done dozens of them and never had an issue. However, if something happens during it, it is probably going to be VERY bad. Have appropriate backups first. – Brian Knoblauch Sep 23 '10 at 17:03
Okay, problem is I don't have anyplace to backup all 500 GB, my other drives are also filled. Is there a way to split large files, transfer them and reassemble them on the NTFS drive? – Rakward Sep 23 '10 at 18:17
@Rakward: sounds like you need to do some risk management. Find the files you can't live without and back them up. Take the risk with what's left. IF you can't back up the files you can't live without then you absolutely need to buy another drive. – hotei Sep 24 '10 at 3:30
Fine, you can't have to many back ups anyway right. Thanks for the help. – Rakward Sep 24 '10 at 7:59
Thanks for the question-er and answer-ers it helped me decide about my disk usage tooo:) – Ravisha Jan 11 '11 at 11:46

My answer, to help people on getting a better approx time for the process.

I have just converted a 1 TB external hard drive from fat32 to ntfs, having about 200 GB of data, and it took about 50 minutes.

however, instead of directly using a command in windows (seven), i used this tool: partition wizard. Anyway, i guess the only difference is that those partition utilities (there are several similar utils, like easeus ) use the built in windows commands, but they do it for you, so you only have to give a few clicks in a nice UI

I was afraid of losing data, since the drive is actually for backups, but it went pretty well, and i expected it to last MUCH longer (i imagined like 3 hours or something). That is precisely why i am giving this answer, to let people better estimate the time it will take for their cases.

For your case, with 500 GB of used space, it may take a couple of hours.

Anyway, as other answers say, there is always a risk, and it is a good idea of having a backup elsewhere, or just take the risk, but don't complain if something gets wrong =)

Oh, and what not everybody mentions, is that you NEED to have some free space in the drive/partition to make the conversion, if you have an almost full disk, it wont let you continue. In my case, having 200 GB used of 1000 GB, it asked for about 1.5 GB of free space, so i had no problem, but other cases may differ.

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What I want to ask here is, how safe is this method on a 1.5 TB drive with 500 GB of data?

While such a conversion is not that risky, if you are genuinely concerned & have a method of backup, then I would suggest doing the way that ensures no issues: Back it up, wipe the volume, rebuild it as NTFS and then copy the data back.

In that way you get a side-by-side backup in the process & get to make sure the process works.

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what is the probable time, a couple of minutes or a whole hour?

I've just converted a 2TB drive from FAT32 to NTFS via command prompt with 200GB of data under 5 minutes, give or take. Since it didn't took me 50 minutes as Diego did, I'm assuming that the conversion via command prompt method is related to the processing power of your CPU as I have a decent CPU (I7 4790k), not unless that wizard Diego used or other unknown factors caused the delay.

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