I believe the "low disk space" warning is from your OS and not from Bitcoin; Bitcoin just crashes. It crashes from the
datadir running out of space, which is only usually on the same disk as the program install.
I was doing a new-install blockchain download speed-test using symlinks to only blkindex.dat and blk0001.dat on a a RAM Disk. I just ran the RAM disk out of space and bitcoind
crashed hard. This could be handled more gracefully, Bitcoin could go into a "read-only" mode, waiting for more free space or such, or back out some data and cleanly close the databases. It was trying to write the blockchain index file when it died, likely the two blockchain files are de-syncronized and unrepairable after an event like this (since there is no "reindex" feature or database scan).
At least I got a chart up to block 187242 that shows how much new blocks suck, even with RAM disk speed:
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fwe.lovebitco.in%2Fimg%2Fblockspeed-preview.png&t=665&c=ls_hVkMr4EPhUg)
===
Barf Logs:===
Console:************************
EXCEPTION: NSt8ios_base7failureE
CAutoFile::write : write failed
C:\Program Files\Bitcoin\daemon\bitcoind.exe in ProcessMessages()
************************
EXCEPTION: 11DbException
DbEnv::txn_checkpoint: No space left on device
C:\Program Files\Bitcoin\daemon\bitcoind.exe in ThreadMessageHandler()
terminate called after throwing an instance of 'DbException'
what(): DbEnv::txn_checkpoint: No space left on device
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.debug.log:
....
received getdata for: block 000000000000005acfa6
received getdata for: block 00000000000175944e69
received getdata for: block 000000000000dd81683e
received getdata for: block 000000000002d56a5dec
received getdata for: block 00000000000020886d4d
received getdata for: block 00000000000291ce2802
askfor tx 4c1d99b248059b3352fa 0
sending getdata: tx 4c1d99b248059b3352fa
************************
EXCEPTION: 11DbException
DbEnv::txn_checkpoint: No space left on device
C:\Program Files\Bitcoin\daemon\bitcoind.exe in ThreadMessageHandler()
accepted connection 46.4.121.99:32459db.log:
write: 0x3e71994, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82493
blkindex.dat: unable to flush page: 82493
write: 0x3ae7f94, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82494
blkindex.dat: unable to flush page: 82494
write: 0x3099efc, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82495
blkindex.dat: unable to flush page: 82495
write: 0x2ae4674, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82496
blkindex.dat: unable to flush page: 82496
write: 0x25574cc, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82497
blkindex.dat: unable to flush page: 82497
write: 0x244a714, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82498
blkindex.dat: unable to flush page: 82498
write: 0x3fdd774, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82499
blkindex.dat: unable to flush page: 82499
write: 0x378cd7c, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82500
blkindex.dat: unable to flush page: 82500
write: 0x2de696c, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82501
blkindex.dat: unable to flush page: 82501
write: 0x2bf958c, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82502
blkindex.dat: unable to flush page: 82502
write: 0x34869d4, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82503
blkindex.dat: unable to flush page: 82503
write: 0x25c06ac, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82504
blkindex.dat: unable to flush page: 82504
write: 0x375a4e4, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82505
blkindex.dat: unable to flush page: 82505
write: 0x28310e4, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82506
blkindex.dat: unable to flush page: 82506
write: 0x3bd071c, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82507
blkindex.dat: unable to flush page: 82507
write: 0x2cc1794, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82508
blkindex.dat: unable to flush page: 82508
write: 0x289c31c, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82509
blkindex.dat: unable to flush page: 82509
write: 0x3a1dd34, 8192: There is not enough space on the disk.
blkindex.dat: write failed for page 82510
blkindex.dat: unable to flush page: 82510
txn_checkpoint: failed to flush the buffer cache: No space left on device